Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

The mail server mangled the URLS again. Try these: 

SPX3 with KX3: www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3_2.JPG
SPX3 Left Oblique: www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique_2
[1].JPG [2]

 

Links:
--
[1] http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
[2] http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

I was horrified to discover the Elecraft mail server mangled the picture
URLs, and added old URLs at the bottom. Please try these, without
quotes: 

SPX3 with KX3: "http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3_2.JPG;
SPX3 Left Oblique:
"http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique_2 [1].JPG [2]"

On 2018-10-18 01:51, Robert Morris wrote:

> SPX3
> Here is an update to the powered external speaker for the KX3 I've been 
> developing, named SPX3. It has required a lot of patience waiting for 
> prototype circuit boards and sheet metal enclosure parts to be fabricated. 
> Refinements are still in process. At any rate, here is the latest. 
> 
> AESTHETICS
> The speaker is designed to match the overall look of the KX3 and PX3, and 
> accept similar third-party panels and covers as for the KX Line. The folks at 
> SIDE KX are working with me on this. Presently, it uses the same feet as the 
> KX3 and PX3, and the same style rear leg as the KX2. It is the same height 
> and depth as the KX3 and PX3. There is one power port for charging the 
> internal lithium battery, and input and output stereo jacks. The speaker is 
> mono. The output jack redirects the right channel from the stereo input for a 
> second speaker, just like with the Elecraft SP3 and other similar external 
> speakers. The speaker is amplified. 
> 
> SPECIFICATIONS
> The SPX3 amplifier puts out a maximum of 5W into a 10W speaker driver, and is 
> about as loud as any external radio speaker gets. Volume is adjusted by the 
> KX3 and by the volume knob on the SPX3. The volume knob also turns it on and 
> off. It plugs into the KX2/KX3 PHONES jack. There is a built-in band pass 
> filter to reduce noise and improve the listening experience. 
> 
> Just like the KX2, KX3 and PX3, the SPX3 is not waterproof. So, don't drop it 
> in a lake. It will handle all conditions appropriate for the KX Line, and is 
> meant for indoor and outdoor use. 
> 
> You'll see the speaker is not a polished finished product yet, as it's a 
> prototype spray painted by hand without labels. A power on LED will be added 
> to the final product. 
> 
> Please note, the KX3 in the photo is only to demonstrate the speaker. 
> 
> Pictures: 
> 
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3_2.JPG
> SPX3 Left Oblique: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique_2 
> [1].JPG [2] 
> 
> 73,
> Robert (AG6ZZ) 
> 
> SPX2, SPX3, are Trademarks (TM) of Robert J. Morris
> SPX2, SPX3 are Copyright (C) 2018 by Robert J. Morris
 

Links:
--
[1] http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
[2] http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
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[Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

SPX3
Here is an update to the powered external speaker for the KX3 I've been
developing, named SPX3. It has required a lot of patience waiting for
prototype circuit boards and sheet metal enclosure parts to be
fabricated. Refinements are still in process. At any rate, here is the
latest. 

AESTHETICS
The speaker is designed to match the overall look of the KX3 and PX3,
and accept similar third-party panels and covers as for the KX Line. The
folks at SIDE KX are working with me on this. Presently, it uses the
same feet as the KX3 and PX3, and the same style rear leg as the KX2. It
is the same height and depth as the KX3 and PX3. There is one power port
for charging the internal lithium battery, and input and output stereo
jacks. The speaker is mono. The output jack redirects the right channel
from the stereo input for a second speaker, just like with the Elecraft
SP3 and other similar external speakers. The speaker is amplified. 

SPECIFICATIONS
The SPX3 amplifier puts out a maximum of 5W into a 10W speaker driver,
and is about as loud as any external radio speaker gets. Volume is
adjusted by the KX3 and by the volume knob on the SPX3. The volume knob
also turns it on and off. It plugs into the KX2/KX3 PHONES jack. There
is a built-in band pass filter to reduce noise and improve the listening
experience. 

Just like the KX2, KX3 and PX3, the SPX3 is not waterproof. So, don't
drop it in a lake. It will handle all conditions appropriate for the KX
Line, and is meant for indoor and outdoor use. 

You'll see the speaker is not a polished finished product yet, as it's a
prototype spray painted by hand without labels. A power on LED will be
added to the final product. 

Please note, the KX3 in the photo is only to demonstrate the speaker. 

Pictures: 

SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3_2.JPG
SPX3 Left Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique_2 [1].JPG [2] 

73,
Robert (AG6ZZ) 

SPX2, SPX3, are Trademarks (TM) of Robert J. Morris
SPX2, SPX3 are Copyright (C) 2018 by Robert J. Morris 

Links:
--
[1] http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
[2] http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Here is my reply to another response which didn't make it to my Inbox. I
try to keep up with everyone's inquiries. The original response is at
the bottom: 

Hi Mark, 

Thanks for your feedback. I've been wondering the same thing about the
grille. A square or rectangular grille would mimic the look of the
Elecraft SP3, which is a plus. On the other hand, in order to have a
volume knob on the face, a square or rectangular grille would likely
force the enclosure to be wider to accommodate both the grille and knob.
The round grille allows a knob to be placed in the corner with ease. 
Also, a round grille weighs less. 

I used a round grille for the first prototype because I was able to
source one that fit the speaker driver I'm using. So, I could at least
have a complete speaker. Fortunately, it looks better than I had
anticipated. Of course, your question is, which would look better? For
many, it comes down to personal preference. I'm open to what you and
others prefer. 

Thanks and 73,
Robert (AG6ZZ) 

-

Robert,

I love the idea, I'm wondering about whether a square or rectangular
speaker grill would look better.  73, 

Mark
KM6HFR
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Hi Joan, 

Thank you for your thoughtful feedback. I don't want to seem to be
arbitrary in my decision making, which is why I wrote the cost-benefit
analysis. Also, I want folks to have a chance to let me know what's most
important to them and inform me of anything I may have overlooked or am
not as studied on as themselves. The bottom line is, what best serves
the users is the best product to produce. 

At present, I'm leaning toward creating just the SPX3 with the following
features: 

1. 12V (9-15V) DC input with same power input jack as the KX3. 

2. Internal, removable, Lithium battery 

3. Operable with or without battery when connected to external power 

4. Power cable with input plug at one end, and no connector at the other


5. Optional power cable with input plug at one end, and PowerPole at the
other 

6. 3.5mm (1/8") Stereo input 

7. Left input channel to amplifier for speaker driver 

8. Reversed Left and Right channels passed to 3.5mm (1/8") stereo
output, unamplified 

9. 2W (3W max) to speaker driver 

10. On/Off volume control. This only affects amplifier and speaker
driver; not pass through to output 

11. 3.5mm (1/8") Stereo cable with two L male ends. 

Items 1, 4, 5, and 10 are what will be new in comparison to the first
prototype. 

Since the KX2 and KX3 have the same look and feel, the SPX3 would
certainly look natural next to either, even though it would be as tall
and deep as the KX3. I'll have to see whether there is demand for a
smaller SPX2 before embarking on it. It would have the same parts
stuffed into a smaller enclosure. 

Adding a switch to make a speaker flip between active and passive would
require a second switch to determine whether the output would be
amplified, or a triple throw switch. After all, when connected to a PC,
the output would not be amplified, but it would be active in order to
power the internal speaker driver. Adding such a switch, which would be
an entirely new feature for a speaker, would add cost and complexity,
and likely cause confusion. It would be much simpler, cheaper, and
straightforward to power the second speaker with a separate cord. I
could put a power output port on it so that a power cord could pass from
one speaker to the other, allowing both to be run from the same battery.
However, if someone is really bent on saving weight and consolidating
the power source, then it seems to me that person would simply remove
both batteries and power both externally. 

In all honesty, the battery doesn't really weigh that much more than a
power cord, is nicely tucked away inside the speaker, and doesn't need
to be connected up along with all the other cords when operating in the
field. The weight of extra switches would offset the weight savings of
removing a battery. Furthermore, this speaker will go all day on a
charge. I turned it on the other day, and fell asleep when it had been
on for over 15 hours connected to my portable music player. So, I don't
really know how long it went before the low battery protection circuit
turned it off. I just know it lasted longer than I did without sleep.
The battery recharges quickly, so you wouldn't have to wait long to go
another day using it nonstop, if you didn't charge it while you slept. 

Thanks and 73,
Robert (AG6ZZ)

On 2018-04-16 19:14, Joan wrote:

> Hey, Robert, here's a thought:  Given the irony of a secondary model (a 
> passive version of the speaker) actually having higher production cost (due 
> to the more limited production run), you could simply produce one model: an 
> active speaker--which has the added versatility of being able to be 
> configured as a passive speaker.  Cost-wise, it would be less expensive to 
> add another 'A' model to serve as a second [passive] speaker (albeit with the 
> amp turned off, with a bypass for the direct feed from an external source).  
> This would only require the 'A' model to be switchable to either L or R input 
> (a channel swap DPDT)--and be able to go into bypass [through] mode 
> 
> Although it may seems wasteful to have a 2nd active speaker doing duty as a 
> passive one, but it would be less expensive to implement (both for producer 
> and user), and, hey, you'd have the utility of having a 2nd active speaker 
> kicking around in your kit (for whatever:) 
> 
> As an incentive [sweetener], Robert, you could offer a discount on ordering a 
> second 'A' speaker at time of purchase 
> 
> Addendum: if you only made one model, an SPX3A, to pair with the KX3, as a 
> KX2 user I would be willing to lump it and purchase them anyway... 'cuz, 
> Elecraft <3 
> 
> FB es 73  de KX2CW  Joan  kn
> 
> Darmok and Jalad at Tanagra, said Piglet. 
> Shaka, when the walls fell, said Pooh.
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Joan]

Hey, Robert, here’s a thought:  Given the irony of a secondary model (a passive 
version of the speaker) actually having higher production cost (due to the more 
limited production run), you could simply produce one model: an active 
speaker—which has the added versatility of being able to be configured as a 
passive speaker.  Cost-wise, it would be less expensive to add another ‘A’ 
model to serve as a second [passive] speaker (albeit with the amp turned off, 
with a bypass for the direct feed from an external source).  This would only 
require the ‘A’ model to be switchable to either L or R input (a channel swap 
DPDT)—and be able to go into bypass [through] mode

Although it may seems wasteful to have a 2nd active speaker doing duty as a 
passive one, but it would be less expensive to implement (both for producer and 
user), and, hey, you’d have the utility of having a 2nd active speaker kicking 
around in your kit (for whatever:)

As an incentive [sweetener], Robert, you could offer a discount on ordering a 
second ‘A’ speaker at time of purchase

Addendum: if you only made one model, an SPX3A, to pair with the KX3, as a KX2 
user I would be willing to lump it and purchase them anyway… ’cuz, Elecraft <3

FB es 73  de KX2CW  Joan  kn


Darmok and Jalad at Tanagra, said Piglet.
Shaka, when the walls fell, said Pooh.

> On Apr 15, 2018, at 20:40, Robert Morris  wrote:
> 
> First of all, I want to say thanks to everyone for all the great feedback 
> I've been getting on the speaker. Here's are some requested features:
> 
> 1. One stereo channel to speaker driver and another channel to output jack 
> (already in first prototype)
> 
> 2. 12V input (planned is 9-15V, like the KX3)
> 
> 3. Separate powered (active) and unpowered (passive) speakers
> The reasons I've gotten for this is that it would save on the weight of and 
> inconvenience of charging a second battery
> 
> 4. Separate volume controls for the internal speaker driver and the output 
> jack
> The reason I've gotten for this is that a computer will need the volume set 
> separately from the speaker.
> Some have stated the computer's software can adjust the gain on the input, 
> and that there only needs to be one volume control for the speaker driver. 
> I'll need consensus on this from the digital mode folks.
> 
> 5. USB power output
> This would be convenient for those who wish to use their speakers as phone 
> chargers.
> 
> Things to consider:
> 
> A. Making two different speakers substantially increases manufacturing costs 
> for the most expensive part; the enclosure. Since most folks will be fine 
> with just one speaker, then the lower production numbers of the passive 
> speaker would make its per unit cost much higher than the active one. 
> However, folks would expect a lower price on the passive one. So, I'd have to 
> sell them as pairs to justify manufacturing the passive ones, which would 
> mean a higher cost to consumers who only want the active one. It would also 
> increase the cost to those who want both because of the two different 
> enclosures instead of just one enclosure twice.
> 
> B. The one issue which would force making both an active and a passive 
> speaker is the need stated by some respondents that the active one would 
> require a second volume control for the output to the computer for digital 
> modes. It would be expensive and time consuming for me to try every digital 
> mode software on every operating system, so I need confirmation whether this 
> is truly necessary.
> 
> C. If a second volume control is not truly necessary, then that simplifies 
> things tremendously. I'll wait for consensus on this before going into why.
> 
> D. A USB power output port is beyond the scope of the speaker's intended 
> utility. Also, it would draw down the battery at the cost of significantly 
> limiting how long the speaker could be used before needing a recharge. 
> Furthermore, the extra hole and port would increase the cost while reducing 
> ingress protection. Lastly, there's not much room in the small enclosure to 
> accomodate nonessential items.
> 
> Thanks and 73,
> Robert (AG6ZZ)
> 
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Hi Bill, 

My post from this morning says the speaker will be outputting both
channels, so this is good news for users of such software. 

Thanks and 73,
Robert (AG6ZZ)

On 2018-04-16 10:15, Bill Frantz wrote:

> Some RTTY software supports the subreceiver with dual decode, using both left 
> and right channels on the K3/K3S. I haven't experimented with dual watch on 
> the KX3, but it is probably useful to get both channels into the PC for 
> digimodes.
> 
> 73 Bill AE6JV
> 
> On 4/16/18 at 4:50 AM, donw...@embarqmail.com (Don Wilhelm) wrote:
> 
>> It is not the KX2/KX3 that decides which channel from the soundcard is used, 
>> but the PC application software.  In general the left channel is used for 
>> digital work, but some can reverse it.
>> So it is best to buffer the PHONES output and send it off to a separate jack.
> 
> ---
> Bill Frantz| I don't have high-speed  | Periwinkle
> (408)356-8506  | internet. I have DSL.| 16345 Englewood Ave
> www.pwpconsult.com [1] |  | Los Gatos, CA 95032
 

Links:
--
[1] http://www.pwpconsult.com
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Bill Frantz]

Some RTTY software supports the subreceiver with dual decode, 
using both left and right channels on the K3/K3S. I haven't 
experimented with dual watch on the KX3, but it is probably 
useful to get both channels into the PC for digimodes.


73 Bill AE6JV

On 4/16/18 at 4:50 AM, donw...@embarqmail.com (Don Wilhelm) wrote:

It is not the KX2/KX3 that decides which channel from the 
soundcard is used, but the PC application software.  In 
general the left channel is used for digital work, but some can 
reverse it.

So it is best to buffer the PHONES output and send it off to a separate jack.


---
Bill Frantz| I don't have high-speed  | Periwinkle
(408)356-8506  | internet. I have DSL.| 16345 
Englewood Ave
www.pwpconsult.com |  | Los Gatos, 
CA 95032


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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Hi Don, 

Thanks for clarifying that. This is an easy one. I'll just send both
channels to the output port, but reversed, so the right channel still
becomes the left for the second speaker. Since they're both carrying the
same signal, it doesn't make any difference to the computer. Only the
left channel goes to the amplifier. I'll put both input and output ports
on the second speaker as well, so both can be connected at the same time
as the computer. Since they'll both have on/off volume controls, either
can be muted by turning it off. The on/off volume controls don't affect
the signal passing through the input and output ports; just what goes to
the speaker driver. 

So, this change means I'm back to amplifying each speaker individually.
To save weight and the inconvenience of charging two, both can be
powered externally without the internal battery installed. Also, if
folks would prefer it, I could put a power output port on the speaker,
and include a speaker-to-speaker power cord so that the battery in one
could power both for folks taking them portable. Or will folks taking
them portable be taking just one? 

Thanks and 73,
Robert (AG6ZZ)

On 2018-04-16 04:50, Don Wilhelm wrote:

> Robert,
> 
> It is not the KX2/KX3 that decides which channel from the soundcard is used, 
> but the PC application software.  In general the left channel is used for 
> digital work, but some can reverse it.
> So it is best to buffer the PHONES output and send it off to a separate jack.
> 
> 73,
> Don W3FPR
> 
> On 4/16/2018 12:48 AM, Robert Morris wrote: 
> 
>> Hi Don,
>> 
>> Thanks for your feedback. I'm hoping one volume knob will do the job for 
>> everyone else too. Plus, if the KX3 puts out enough signal for the PC, then 
>> you don't really want an amplifier in the signal path.
>> 
>> I want to be sure about the channel which needs to go to the sound card. Are 
>> you saying the left channel from the KX3 is the one the computer needs, or 
>> are you saying the computer needs the signal to be present on the left 
>> channel of its input? If it's the latter, then that is already how the SPX3 
>> is wired.
>> 
>> For the first prototype, the stereo output of the KX3 goes into the SPX3 
>> input port, then is split. The left channel goes to the amplifier, and the 
>> right goes to the left channel of the output port. Will that do the job, or 
>> does the computer really need the signal which originated from the left 
>> channel of the KX3? I don't see in the KX3 manual where it specifies which 
>> channel the digital mode signal is output. I had assumed it would be on both 
>> left and right channels.
>> 
>> Thanks and 73,
>> Robert (AG6ZZ)
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Don Wilhelm]

Robert,

It is not the KX2/KX3 that decides which channel from the soundcard is 
used, but the PC application software.  In general the left channel is 
used for digital work, but some can reverse it.
So it is best to buffer the PHONES output and send it off to a separate 
jack.


73,
Don W3FPR

On 4/16/2018 12:48 AM, Robert Morris wrote:


Hi Don,

Thanks for your feedback. I'm hoping one volume knob will do the job 
for everyone else too. Plus, if the KX3 puts out enough signal for the 
PC, then you don't really want an amplifier in the signal path.


I want to be sure about the channel which needs to go to the sound 
card. Are you saying the left channel from the KX3 is the one the 
computer needs, or are you saying the computer needs the signal to be 
present on the left channel of its input? If it's the latter, then 
that is already how the SPX3 is wired.


For the first prototype, the stereo output of the KX3 goes into the 
SPX3 input port, then is split. The left channel goes to the 
amplifier, and the right goes to the left channel of the output port. 
Will that do the job, or does the computer really need the signal 
which originated from the left channel of the KX3? I don't see in the 
KX3 manual where it specifies which channel the digital mode signal is 
output. I had assumed it would be on both left and right channels.


Thanks and 73,
Robert (AG6ZZ)


On 2018-04-15 21:24, Don Wilhelm wrote:


Robert,

You will need to provide a means of connecting the KX2/KX3 PHONES 
output to a soundcard for the use of digital modes.


The KXSPA should connect to the left channel since that is the 
channel that is normally used by soundcard digital.


I think that means you would want to provide a knob controlled gain 
control on your active speaker so the sound level to the speakers can 
be controlled without disturbing the level to the soundcard being 
used for digital modes.


73,
Don W3FPR

On 4/15/2018 11:40 PM, Robert Morris wrote:
First of all, I want to say thanks to everyone for all the great 
feedback I've been getting on the speaker. Here's are some requested 
features:


1. One stereo channel to speaker driver and another channel to 
output jack (already in first prototype)


2. 12V input (planned is 9-15V, like the KX3)

3. Separate powered (active) and unpowered (passive) speakers
The reasons I've gotten for this is that it would save on the weight 
of and inconvenience of charging a second battery


4. Separate volume controls for the internal speaker driver and the 
output jack
The reason I've gotten for this is that a computer will need the 
volume set separately from the speaker.
Some have stated the computer's software can adjust the gain on the 
input, and that there only needs to be one volume control for the 
speaker driver. I'll need consensus on this from the digital mode folks.


5. USB power output
This would be convenient for those who wish to use their speakers as 
phone chargers.


Things to consider:

A. Making two different speakers substantially increases 
manufacturing costs for the most expensive part; the enclosure. 
Since most folks will be fine with just one speaker, then the lower 
production numbers of the passive speaker would make its per unit 
cost much higher than the active one. However, folks would expect a 
lower price on the passive one. So, I'd have to sell them as pairs 
to justify manufacturing the passive ones, which would mean a higher 
cost to consumers who only want the active one. It would also 
increase the cost to those who want both because of the two 
different enclosures instead of just one enclosure twice.


B. The one issue which would force making both an active and a 
passive speaker is the need stated by some respondents that the 
active one would require a second volume control for the output to 
the computer for digital modes. It would be expensive and time 
consuming for me to try every digital mode software on every 
operating system, so I need confirmation whether this is truly 
necessary.


C. If a second volume control is not truly necessary, then that 
simplifies things tremendously. I'll wait for consensus on this 
before going into why.


D. A USB power output port is beyond the scope of the speaker's 
intended utility. Also, it would draw down the battery at the cost 
of significantly limiting how long the speaker could be used before 
needing a recharge. Furthermore, the extra hole and port would 
increase the cost while reducing ingress protection. Lastly, there's 
not much room in the small enclosure to accomodate nonessential items.


Thanks and 73,
Robert (AG6ZZ)
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Hi Don, 

Thanks for your feedback. I'm hoping one volume knob will do the job for
everyone else too. Plus, if the KX3 puts out enough signal for the PC,
then you don't really want an amplifier in the signal path. 

I want to be sure about the channel which needs to go to the sound card.
Are you saying the left channel from the KX3 is the one the computer
needs, or are you saying the computer needs the signal to be present on
the left channel of its input? If it's the latter, then that is already
how the SPX3 is wired. 

For the first prototype, the stereo output of the KX3 goes into the SPX3
input port, then is split. The left channel goes to the amplifier, and
the right goes to the left channel of the output port. Will that do the
job, or does the computer really need the signal which originated from
the left channel of the KX3? I don't see in the KX3 manual where it
specifies which channel the digital mode signal is output. I had assumed
it would be on both left and right channels. 

Thanks and 73,
Robert (AG6ZZ)

On 2018-04-15 21:24, Don Wilhelm wrote:

> Robert,
> 
> You will need to provide a means of connecting the KX2/KX3 PHONES output to a 
> soundcard for the use of digital modes.
> 
> The KXSPA should connect to the left channel since that is the channel that 
> is normally used by soundcard digital.
> 
> I think that means you would want to provide a knob controlled gain control 
> on your active speaker so the sound level to the speakers can be controlled 
> without disturbing the level to the soundcard being used for digital modes.
> 
> 73,
> Don W3FPR
> 
> On 4/15/2018 11:40 PM, Robert Morris wrote: 
> 
>> First of all, I want to say thanks to everyone for all the great feedback 
>> I've been getting on the speaker. Here's are some requested features:
>> 
>> 1. One stereo channel to speaker driver and another channel to output jack 
>> (already in first prototype)
>> 
>> 2. 12V input (planned is 9-15V, like the KX3)
>> 
>> 3. Separate powered (active) and unpowered (passive) speakers
>> The reasons I've gotten for this is that it would save on the weight of and 
>> inconvenience of charging a second battery
>> 
>> 4. Separate volume controls for the internal speaker driver and the output 
>> jack
>> The reason I've gotten for this is that a computer will need the volume set 
>> separately from the speaker.
>> Some have stated the computer's software can adjust the gain on the input, 
>> and that there only needs to be one volume control for the speaker driver. 
>> I'll need consensus on this from the digital mode folks.
>> 
>> 5. USB power output
>> This would be convenient for those who wish to use their speakers as phone 
>> chargers.
>> 
>> Things to consider:
>> 
>> A. Making two different speakers substantially increases manufacturing costs 
>> for the most expensive part; the enclosure. Since most folks will be fine 
>> with just one speaker, then the lower production numbers of the passive 
>> speaker would make its per unit cost much higher than the active one. 
>> However, folks would expect a lower price on the passive one. So, I'd have 
>> to sell them as pairs to justify manufacturing the passive ones, which would 
>> mean a higher cost to consumers who only want the active one. It would also 
>> increase the cost to those who want both because of the two different 
>> enclosures instead of just one enclosure twice.
>> 
>> B. The one issue which would force making both an active and a passive 
>> speaker is the need stated by some respondents that the active one would 
>> require a second volume control for the output to the computer for digital 
>> modes. It would be expensive and time consuming for me to try every digital 
>> mode software on every operating system, so I need confirmation whether this 
>> is truly necessary.
>> 
>> C. If a second volume control is not truly necessary, then that simplifies 
>> things tremendously. I'll wait for consensus on this before going into why.
>> 
>> D. A USB power output port is beyond the scope of the speaker's intended 
>> utility. Also, it would draw down the battery at the cost of significantly 
>> limiting how long the speaker could be used before needing a recharge. 
>> Furthermore, the extra hole and port would increase the cost while reducing 
>> ingress protection. Lastly, there's not much room in the small enclosure to 
>> accomodate nonessential items.
>> 
>> Thanks and 73,
>> Robert (AG6ZZ)
>> __
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Don Wilhelm]

Robert,

You will need to provide a means of connecting the KX2/KX3 PHONES output 
to a soundcard for the use of digital modes.


The KXSPA should connect to the left channel since that is the channel 
that is normally used by soundcard digital.


I think that means you would want to provide a knob controlled gain 
control on your active speaker so the sound level to the speakers can be 
controlled without disturbing the level to the soundcard being used for 
digital modes.


73,
Don W3FPR

On 4/15/2018 11:40 PM, Robert Morris wrote:
First of all, I want to say thanks to everyone for all the great 
feedback I've been getting on the speaker. Here's are some requested 
features:


1. One stereo channel to speaker driver and another channel to output 
jack (already in first prototype)


2. 12V input (planned is 9-15V, like the KX3)

3. Separate powered (active) and unpowered (passive) speakers
The reasons I've gotten for this is that it would save on the weight of 
and inconvenience of charging a second battery


4. Separate volume controls for the internal speaker driver and the 
output jack
The reason I've gotten for this is that a computer will need the volume 
set separately from the speaker.
Some have stated the computer's software can adjust the gain on the 
input, and that there only needs to be one volume control for the 
speaker driver. I'll need consensus on this from the digital mode folks.


5. USB power output
This would be convenient for those who wish to use their speakers as 
phone chargers.


Things to consider:

A. Making two different speakers substantially increases manufacturing 
costs for the most expensive part; the enclosure. Since most folks will 
be fine with just one speaker, then the lower production numbers of the 
passive speaker would make its per unit cost much higher than the active 
one. However, folks would expect a lower price on the passive one. So, 
I'd have to sell them as pairs to justify manufacturing the passive 
ones, which would mean a higher cost to consumers who only want the 
active one. It would also increase the cost to those who want both 
because of the two different enclosures instead of just one enclosure 
twice.


B. The one issue which would force making both an active and a passive 
speaker is the need stated by some respondents that the active one would 
require a second volume control for the output to the computer for 
digital modes. It would be expensive and time consuming for me to try 
every digital mode software on every operating system, so I need 
confirmation whether this is truly necessary.


C. If a second volume control is not truly necessary, then that 
simplifies things tremendously. I'll wait for consensus on this before 
going into why.


D. A USB power output port is beyond the scope of the speaker's intended 
utility. Also, it would draw down the battery at the cost of 
significantly limiting how long the speaker could be used before needing 
a recharge. Furthermore, the extra hole and port would increase the cost 
while reducing ingress protection. Lastly, there's not much room in the 
small enclosure to accomodate nonessential items.


Thanks and 73,
Robert (AG6ZZ)
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

First of all, I want to say thanks to everyone for all the great 
feedback I've been getting on the speaker. Here's are some requested 
features:


1. One stereo channel to speaker driver and another channel to output 
jack (already in first prototype)


2. 12V input (planned is 9-15V, like the KX3)

3. Separate powered (active) and unpowered (passive) speakers
The reasons I've gotten for this is that it would save on the weight of 
and inconvenience of charging a second battery


4. Separate volume controls for the internal speaker driver and the 
output jack
The reason I've gotten for this is that a computer will need the volume 
set separately from the speaker.
Some have stated the computer's software can adjust the gain on the 
input, and that there only needs to be one volume control for the 
speaker driver. I'll need consensus on this from the digital mode folks.


5. USB power output
This would be convenient for those who wish to use their speakers as 
phone chargers.


Things to consider:

A. Making two different speakers substantially increases manufacturing 
costs for the most expensive part; the enclosure. Since most folks will 
be fine with just one speaker, then the lower production numbers of the 
passive speaker would make its per unit cost much higher than the active 
one. However, folks would expect a lower price on the passive one. So, 
I'd have to sell them as pairs to justify manufacturing the passive 
ones, which would mean a higher cost to consumers who only want the 
active one. It would also increase the cost to those who want both 
because of the two different enclosures instead of just one enclosure 
twice.


B. The one issue which would force making both an active and a passive 
speaker is the need stated by some respondents that the active one would 
require a second volume control for the output to the computer for 
digital modes. It would be expensive and time consuming for me to try 
every digital mode software on every operating system, so I need 
confirmation whether this is truly necessary.


C. If a second volume control is not truly necessary, then that 
simplifies things tremendously. I'll wait for consensus on this before 
going into why.


D. A USB power output port is beyond the scope of the speaker's intended 
utility. Also, it would draw down the battery at the cost of 
significantly limiting how long the speaker could be used before needing 
a recharge. Furthermore, the extra hole and port would increase the cost 
while reducing ingress protection. Lastly, there's not much room in the 
small enclosure to accomodate nonessential items.


Thanks and 73,
Robert (AG6ZZ)
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Mark Wheeler]

Robert,

I really like the idea of a matching active and passive speaker set for the 
KX3; I’d be very interested in having one active one, with an internal 
rechargeable battery, and one passive one. Having a USB on the side for 
additional functionality is also very desirable. Thanks for considering.  

73, Mark
KM6HFR 
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Don Wilhelm]

Keith,

You can already do that with a simple stereo cable to connect the 
KX2/KX3 PHONES jack to your computer soundcard input.


The computer soundcard level can be changed without varying the KX2/KX3 
AF gain.


73,
Don W3FPR

On 4/14/2018 9:47 PM, Keith Onishi wrote:

I would prefer followings;

1. a stereo audio output which can be connected to PC audio input.
2. a VR for changing SP output level without changing KX3/KX2 AF VOL

These are useful to operate digital modes.

73 de JH3SIF, Keith
  

2018/04/13 2:06、Robert J. Morris のメール:

I've built a prototype powered external speaker for the KX3, and would
like some feedback on what folks would desire in terms of features, and
whether folks would want to own one.

The speaker currently is designed to match the overall look of the KX3
and PX3, and accept similar third-party panels and covers as for the KX
line. Presently, it uses the same legs and feet as the KX3 and PX3, and
is the same height and depth as those. There is one USB port for
charging the internal lithium battery, and input and output stereo
jacks. The speaker is mono. The output jack redirects the right channel
from the stereo input for a second speaker, just like with the Elecraft
SP3 and other similar external speakers. The speaker is amplified.

The SPX3 puts out a maximum of 3W, and is about as loud as any external
radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
PHONES jack. There is a built-in low pass filter to reduce noise and
improve the listening experience.

The prototype, as you'll see in pictures in the links below, is slightly
narrower than the expected finished product. The speaker driver and
on/off switch are both waterproof, but - just like the KX3 and PX3 - the
case isn't. So, don't drop it in a lake. It will handle all conditions
appropriate for the KX3, and is meant for indoor and outdoor use. Having
matched the case design so closely to the KX3, it isn't as airtight as
I'd like it, so the next prototype will have the case halves join in a
more customary way, but remain the same dimensions and overall look.
This will also improve ingress protection.

You'll see the speaker is not a polished finished product yet, as it's a
rough first prototype made by hand. Your feedback will assure the final
product is what you want gracing your portable shack.

Please note, the KX3 in the photo is only to demonstrate the speaker.

All feedback is welcome. Please let me know which reasonable
enhancements or simplifications you'd like to see.
Examples:
* Would you want an output USB port to use the speaker to charge your
phone?
* Would you want to dispense with the built-in battery, and run it
entirely from external power?
* Would you want a second passive speaker driven by the first to save on
weight and cost? That is, a SPX3A (active, with battery, charger, and
amp) and SPX3P (passive, with only speaker driver)
* If you're a KX2 user, would you like me to produce the SPX2 (also in
development)?

Pictures:
SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
SPX3 Left Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
SPX3 Right Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG

73,
Robert (AG6ZZ)

SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
J. Morris
SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
Robert J. Morris
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Keith Onishi]

I would prefer followings;

1. a stereo audio output which can be connected to PC audio input.
2. a VR for changing SP output level without changing KX3/KX2 AF VOL

These are useful to operate digital modes.

73 de JH3SIF, Keith
 
> 2018/04/13 2:06、Robert J. Morris のメール:
> 
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one. 
> 
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified. 
> 
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience. 
> 
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection. 
> 
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack. 
> 
> Please note, the KX3 in the photo is only to demonstrate the speaker. 
> 
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)? 
> 
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG 
> 
> 73,
> Robert (AG6ZZ) 
> 
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker (Mark Wheeler/KM6HFR)

[Mark Wheeler]

Robert,

I love the idea, I’m wondering about whether a square or rectangular speaker 
grill would look better.  73, 

Mark
KM6HFR 

> On Apr 14, 2018, at 5:24 PM, elecraft-requ...@mailman.qth.net wrote:
> 
> Re: [KX3] New Product: SPX3 External Speaker
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

I just found the message at the bottom from Bob N3MNT in the online 
archive. I don't know why it wasn't emailed to me. Here's my response:


Hi Bob,

Thanks for your inquiry.

The first prototype, though fully functional, is a proof of concept, and 
far from the final product. I'm making changes to the amplifier and 
enclosure which will alter the sound of the speaker. Also, the speaker 
driver may change. So, it's premature to make judgements of its sound 
quality right now. Furthermore, listening to recordings of audio 
equipment leaves a lot to be desired. After all, you wouldn't be 
listening to the SPX3 itself, but to what was picked up by the 
microphone and recording equipment I would have available, then played 
back on whatever computer, audio gear, and speakers or headphone you 
have on hand. Not only that, what sounds best to you may be different 
than what sounds best to someone standing next to you. It would be best 
to hear the final product in person.


My endeavor is to create a product that sounds as good as possible to 
most listeners within the compromises necessary to get all the features 
folks most want in a very small, crowded enclosure and keep the price 
reasonable for what folks will be purchasing. Then, improve it as users 
provide feedback from how they choose to use it.


Thanks and 73,
Robert (AG6ZZ)

--

Bob N3MNT Fri, 13 Apr 2018 13:59:07 -0700

If possible could yu post an audio clip with both SSB and CW.

--
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

I just found the message at the bottom from Bob N3MNT in the online 
archive. I don't know why it wasn't emailed to me. Here's my response:


Hi Bob,

Thanks for your inquiry.

The first prototype, though fully functional, is a proof of concept, and 
far from the final product. I'm making changes to the amplifier and 
enclosure which will alter the sound of the speaker. Also, the speaker 
driver may change. So, it's premature to make judgements of its sound 
quality right now. Furthermore, listening to recordings of audio 
equipment leaves a lot to be desired. After all, you wouldn't be 
listening to the SPX3 itself, but to what was picked up by the 
microphone and recording equipment I would have available, then played 
back on whatever computer, audio gear, and speakers or headphone you 
have on hand. Not only that, what sounds best to you may be different 
than what sounds best to someone standing next to you. It would be best 
to hear the final product in person.


My endeavor is to create a product that sounds as good as possible to 
most listeners within the compromises necessary to get all the features 
folks most want in a very small, crowded enclosure and keep the price 
reasonable for what folks will be purchasing. Then, improve it as users 
provide feedback from how they choose to use it.


Thanks and 73,
Robert (AG6ZZ)

--

Bob N3MNT Fri, 13 Apr 2018 13:59:07 -0700

If possible could yu post an audio clip with both SSB and CW.

--
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

I just spotted this in the online archive which wasn't emailed to me. I
apologize in a advance for others who post replies without getting a
response from me. If the list server doesn't send me a copy, I may not
spot it in the archive. The original message is at the bottom. First is
my reply: 

Hi Walter, 

Thanks for your feedback. I appreciate it. Yes, I'm aware of that
amplifier. It would be appropriate for driving bookshelf HiFi speakers,
as your writeup demonstrates - cool project, by the way. Aside from 15W
being overkill for driving the 2W/3W driver in the SPX3, it wouldn't fit
in the enclosure, and would need to be modified by hand to work as
needed even if it did fit. Most transceiver external speakers put out
2-3W, as that's all that's necessary for listening to voice and CW at
close range. Plus, when taking the SPX3 portable, it needs to last a
long time on a battery. 15W per channel (30W) would drain a battery
mighty quick. I turned the prototype on this morning when I got up, and
it's still running after more than 15 hours on the same battery charge. 

The SPX3 sports features specific to what the KX3 needs, such as a low
pass filter, built-in battery and charging circuitry, a shielded
enclosure to eliminate RF from the antenna affecting the audio, works
great outdoors, the speaker cone won't get damaged if it gets wet, and
more. Plus, it matches the KX3 and supports KX panels and covers
(already in talks with the SIDE KX folks). You might want a pair
yourself to take on the road. 

Thanks and 73,
Robert (AG6ZZ) 

---

Walter Underwood [1] Fri, 13 Apr 2018 11:58:12 -0700 [2] 

I use this 12 V audio amp. It would be easy to put it inside a speaker.
It 
seems to vary in price a bit. Today it is $8.50, on the low side.

"DROK TDA7297 15W+15W Audio Power Amplifier Module AC/DC 9-18V 2.0 Dual
Channel 
Stereo Amp Board"
https://smile.amazon.com/DROK-Amplifier-Amplify-Digital-Portable/dp/B00C4MT274/

At home, I stick it to the top of one of the speakers with velcro.
Writeup is 
here:

https://observer.wunderwood.org/2017/03/04/speakers-for-my-elecraft-kx3/

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

 

Links:
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[1]
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[2]
https://www.mail-archive.com/search?l=elecraft@mailman.qth.netq=date:20180413
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

I just found the message at the bottom from Bob N3MNT in the online
archive. I don't know why it wasn't emailed to me. Here's my response:

Hi Bob,

Thanks for your inquiry.

The first prototype, though fully functional, is a proof of concept, and
far from the final product. I'm making changes to the amplifier and
enclosure which will alter the sound of the speaker. Also, the speaker
driver may change. So, it's premature to make judgements of its sound
quality. Furthermore, you should be aware that listening to recordings
of audio equipment leaves a lot to be desired. After all, you wouldn't
be listening to the SPX3 itself, but to what was picked up by the
microphone and recording equipment I would have available, then played
back on whatever computer, audio gear, and speakers or headphone you
have on hand. Not only that, what sounds best to you may be different
than what sounds best to someone standing next to you. It would be best
to hear the final product in person.

My endeavor is to create a product that sounds as good as possible to
most listeners within the compromises necessary to get all the features
folks most want in a very small, crowded enclosure and keep the price
reasonable for what folks will be purchasing. Then, improve it as users
provide feedback from how they choose to use it.

Thanks and 73,
Robert (AG6ZZ)

--

Bob N3MNT [1] Fri, 13 Apr 2018 13:59:07 -0700 [2] 

If possible could yu post an audio clip with both SSB and CW.  

--
 

Links:
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[1]
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[2]
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Bob N3MNT]

If possible could yu post an audio clip with both SSB and CW.  



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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Hi Fred, 

Thanks for your feedback. I appreciate it very much. I guess I didn't
make it clear enough in the long description. The SPX3 already has
support for exactly what you're requesting. Just like the Elecraft SP3
and other similar desktop radio speakers, it splits the right channel
and sends it out the left channel of the output stereo jack. The right
channel of the output is unused. (or did I split off the left channel?
same difference) That way, two identical speakers can be used in stereo
when daisy-chained. 

Since the SPX3 tilts to have the driver cone aimed up at an angle, I
find it more easily puts my ears in the listening sweet spot than having
to prop up a forward facing speaker on a shelf. At any rate, the dual
watch and stereo effects features of the KX3 can be enjoyed using a pair
of SPX3s; likely as SPX3A and SPX3P. Also, the amplified SPX3 or SPX3A
can be powered externally, with or without the internal battery. 

This brings us to a big question. Should I sell the SPX3A and SPX3P as a
pair, or separately? 

Thanks and 73,
Robert (AG6ZZ)

On 2018-04-13 13:23, Cady, Fred wrote:

> Hi Robert, 
> 
> I'm thinking you could greatly expand your potential market by having two 
> speakers and supporting stereo audio.  That way people could use the KX3 dual 
> watch feature without having to plug in headphones.  It might also be 
> attractive for K3 users (like me) suffering from a space problem.  I use the 
> West Mountain speakers and love them but would like something smaller. 
> 
> Just a thought. 
> 
> Good luck. 
> 
> 73, 
> 
> Fred KE7X 
> 
> -
> 
> FROM: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on 
> behalf of John Gibson <gib...@alma.edu>
> SENT: Friday, April 13, 2018 12:32 PM
> TO: Robert J. Morris; elecraft@mailman.qth.net
> SUBJECT: Re: [Elecraft] [KX3] New Product: SPX3 External Speaker 
> 
> Hi Robert,
> 
> Your proposed speaker looks interesting. Thank you for offering it.
> 
> My need is a little different. I want to use a KX2 for portable emergency 
> communication, powering it directly from a 12V lithium iron phosphate (LFP) 
> battery. For this application I would like to power an external amplified 
> speaker directly from the same 12V LFP battery. I would be rather not have to 
> recharge an amplified speaker's internal battery.
> 
> 73,
> John, no8v
> 
> 
> From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on 
> behalf of Robert J. Morris <ag...@iloc.com>
> Sent: Thursday, April 12, 2018 1:06:25 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker
> 
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
> 
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
> 
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
> 
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
> 
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
> 
> Please note, the KX3 in the photo is only to demonstrate the speaker.
> 
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications

Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Cady, Fred]

Hi Robert,

I'm thinking you could greatly expand your potential market by having two 
speakers and supporting stereo audio.  That way people could use the KX3 dual 
watch feature without having to plug in headphones.  It might also be 
attractive for K3 users (like me) suffering from a space problem.  I use the 
West Mountain speakers and love them but would like something smaller.

Just a thought.

Good luck.

73,

Fred KE7X




From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on 
behalf of John Gibson <gib...@alma.edu>
Sent: Friday, April 13, 2018 12:32 PM
To: Robert J. Morris; elecraft@mailman.qth.net
Subject: Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

Hi Robert,

Your proposed speaker looks interesting. Thank you for offering it.

My need is a little different. I want to use a KX2 for portable emergency 
communication, powering it directly from a 12V lithium iron phosphate (LFP) 
battery. For this application I would like to power an external amplified 
speaker directly from the same 12V LFP battery. I would be rather not have to 
recharge an amplified speaker's internal battery.

73,
John, no8v


From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on 
behalf of Robert J. Morris <ag...@iloc.com>
Sent: Thursday, April 12, 2018 1:06:25 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker

I've built a prototype powered external speaker for the KX3, and would
like some feedback on what folks would desire in terms of features, and
whether folks would want to own one.

The speaker currently is designed to match the overall look of the KX3
and PX3, and accept similar third-party panels and covers as for the KX
line. Presently, it uses the same legs and feet as the KX3 and PX3, and
is the same height and depth as those. There is one USB port for
charging the internal lithium battery, and input and output stereo
jacks. The speaker is mono. The output jack redirects the right channel
from the stereo input for a second speaker, just like with the Elecraft
SP3 and other similar external speakers. The speaker is amplified.

The SPX3 puts out a maximum of 3W, and is about as loud as any external
radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
PHONES jack. There is a built-in low pass filter to reduce noise and
improve the listening experience.

The prototype, as you'll see in pictures in the links below, is slightly
narrower than the expected finished product. The speaker driver and
on/off switch are both waterproof, but - just like the KX3 and PX3 - the
case isn't. So, don't drop it in a lake. It will handle all conditions
appropriate for the KX3, and is meant for indoor and outdoor use. Having
matched the case design so closely to the KX3, it isn't as airtight as
I'd like it, so the next prototype will have the case halves join in a
more customary way, but remain the same dimensions and overall look.
This will also improve ingress protection.

You'll see the speaker is not a polished finished product yet, as it's a
rough first prototype made by hand. Your feedback will assure the final
product is what you want gracing your portable shack.

Please note, the KX3 in the photo is only to demonstrate the speaker.

All feedback is welcome. Please let me know which reasonable
enhancements or simplifications you'd like to see.
Examples:
* Would you want an output USB port to use the speaker to charge your
phone?
* Would you want to dispense with the built-in battery, and run it
entirely from external power?
* Would you want a second passive speaker driven by the first to save on
weight and cost? That is, a SPX3A (active, with battery, charger, and
amp) and SPX3P (passive, with only speaker driver)
* If you're a KX2 user, would you like me to produce the SPX2 (also in
development)?

Pictures:
SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
SPX3 Left Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
SPX3 Right Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG

73,
Robert (AG6ZZ)

SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
J. Morris
SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
Robert J. Morris
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Hi John, 

Thanks for your feedback. It appears I didn't point out that the speaker
can be powered externally, with or without an internal battery. I'm also
going to change the power requirement to the standard ham shack
12V/13.8V. Actually, it will accept the same voltage range as the KX3
(9-15V DC). 

73,
Robert (AG6ZZ)

On 2018-04-13 11:32, John Gibson wrote:

> Hi Robert,
> 
> Your proposed speaker looks interesting. Thank you for offering it.
> 
> My need is a little different. I want to use a KX2 for portable emergency 
> communication, powering it directly from a 12V lithium iron phosphate (LFP) 
> battery. For this application I would like to power an external amplified 
> speaker directly from the same 12V LFP battery. I would be rather not have to 
> recharge an amplified speaker's internal battery.
> 
> 73,
> John, no8v
> 
> 
> From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on 
> behalf of Robert J. Morris <ag...@iloc.com>
> Sent: Thursday, April 12, 2018 1:06:25 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker
> 
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
> 
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
> 
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
> 
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
> 
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
> 
> Please note, the KX3 in the photo is only to demonstrate the speaker.
> 
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)?
> 
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
> 
> 73,
> Robert (AG6ZZ)
> 
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
> __
> Elecraft mailing list
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Walter Underwood]

I use this 12 V audio amp. It would be easy to put it inside a speaker. It 
seems to vary in price a bit. Today it is $8.50, on the low side.

"DROK TDA7297 15W+15W Audio Power Amplifier Module AC/DC 9-18V 2.0 Dual Channel 
Stereo Amp Board"
https://smile.amazon.com/DROK-Amplifier-Amplify-Digital-Portable/dp/B00C4MT274/

At home, I stick it to the top of one of the speakers with velcro. Writeup is 
here:

https://observer.wunderwood.org/2017/03/04/speakers-for-my-elecraft-kx3/

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Apr 13, 2018, at 11:32 AM, John Gibson <gib...@alma.edu> wrote:
> 
> Hi Robert,
> 
> Your proposed speaker looks interesting. Thank you for offering it.
> 
> My need is a little different. I want to use a KX2 for portable emergency 
> communication, powering it directly from a 12V lithium iron phosphate (LFP) 
> battery. For this application I would like to power an external amplified 
> speaker directly from the same 12V LFP battery. I would be rather not have to 
> recharge an amplified speaker's internal battery.
> 
> 73,
> John, no8v
> 
> 
> From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on 
> behalf of Robert J. Morris <ag...@iloc.com>
> Sent: Thursday, April 12, 2018 1:06:25 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker
> 
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
> 
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
> 
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
> 
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
> 
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
> 
> Please note, the KX3 in the photo is only to demonstrate the speaker.
> 
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)?
> 
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
> 
> 73,
> Robert (AG6ZZ)
> 
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
>

Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[John Gibson]

Hi Robert,

Your proposed speaker looks interesting. Thank you for offering it.

My need is a little different. I want to use a KX2 for portable emergency 
communication, powering it directly from a 12V lithium iron phosphate (LFP) 
battery. For this application I would like to power an external amplified 
speaker directly from the same 12V LFP battery. I would be rather not have to 
recharge an amplified speaker's internal battery.

73,
John, no8v


From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on 
behalf of Robert J. Morris <ag...@iloc.com>
Sent: Thursday, April 12, 2018 1:06:25 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker

I've built a prototype powered external speaker for the KX3, and would
like some feedback on what folks would desire in terms of features, and
whether folks would want to own one.

The speaker currently is designed to match the overall look of the KX3
and PX3, and accept similar third-party panels and covers as for the KX
line. Presently, it uses the same legs and feet as the KX3 and PX3, and
is the same height and depth as those. There is one USB port for
charging the internal lithium battery, and input and output stereo
jacks. The speaker is mono. The output jack redirects the right channel
from the stereo input for a second speaker, just like with the Elecraft
SP3 and other similar external speakers. The speaker is amplified.

The SPX3 puts out a maximum of 3W, and is about as loud as any external
radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
PHONES jack. There is a built-in low pass filter to reduce noise and
improve the listening experience.

The prototype, as you'll see in pictures in the links below, is slightly
narrower than the expected finished product. The speaker driver and
on/off switch are both waterproof, but - just like the KX3 and PX3 - the
case isn't. So, don't drop it in a lake. It will handle all conditions
appropriate for the KX3, and is meant for indoor and outdoor use. Having
matched the case design so closely to the KX3, it isn't as airtight as
I'd like it, so the next prototype will have the case halves join in a
more customary way, but remain the same dimensions and overall look.
This will also improve ingress protection.

You'll see the speaker is not a polished finished product yet, as it's a
rough first prototype made by hand. Your feedback will assure the final
product is what you want gracing your portable shack.

Please note, the KX3 in the photo is only to demonstrate the speaker.

All feedback is welcome. Please let me know which reasonable
enhancements or simplifications you'd like to see.
Examples:
* Would you want an output USB port to use the speaker to charge your
phone?
* Would you want to dispense with the built-in battery, and run it
entirely from external power?
* Would you want a second passive speaker driven by the first to save on
weight and cost? That is, a SPX3A (active, with battery, charger, and
amp) and SPX3P (passive, with only speaker driver)
* If you're a KX2 user, would you like me to produce the SPX2 (also in
development)?

Pictures:
SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
SPX3 Left Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
SPX3 Right Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG

73,
Robert (AG6ZZ)

SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
J. Morris
SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
Robert J. Morris
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Thanks for the feedback, Joan. It appears the active and passive
versions are what folks would like. 

73,
Robert (AG6ZZ)

On 2018-04-12 23:53, Joan wrote:

> What I would love [to buy] for the KX2: a pair of speakers, thus: an SPX2A 
> speaker (with an inboard stereo amplifier) which can be used alone as a 
> monaural speaker--but which is also configurable for stereo audio with the 
> addition of the optional SPX2P 
> 
> Joan KX2CW 
> 
> Darmok and Jalad at Tanagra, said Piglet. 
> Shaka, when the walls fell, said Pooh.
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Joan]

What I would love [to buy] for the KX2: a pair of speakers, thus: an SPX2A 
speaker (with an inboard stereo amplifier) which can be used alone as a 
monaural speaker—but which is also configurable for stereo audio with the 
addition of the optional SPX2P

Joan KX2CW

Darmok and Jalad at Tanagra, said Piglet.
Shaka, when the walls fell, said Pooh.

> On Apr 12, 2018, at 10:06, Robert J. Morris  wrote:
> 
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one. 
> 
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified. 
> 
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience. 
> 
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection. 
> 
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack. 
> 
> Please note, the KX3 in the photo is only to demonstrate the speaker. 
> 
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)? 
> 
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG 
> 
> 73,
> Robert (AG6ZZ) 
> 
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert Morris]

Hi Paul, 

Thanks for sharing your interest. I'm glad you don't want a USB output
port. Although it wouldn't be difficult, it's beyond the purpose of the
product. 

73,
Robert (AG6ZZ)

On 2018-04-12 15:58, Paul Van Dyke wrote:

> I am interested .. the battery operation in interesting .. no usb for my phone
> 
> Paul  KB9AVO
> 
> On 4/12/18, Robert J. Morris  wrote: 
> 
>> I've built a prototype powered external speaker for the KX3, and would
>> like some feedback on what folks would desire in terms of features, and
>> whether folks would want to own one.
>> 
>> The speaker currently is designed to match the overall look of the KX3
>> and PX3, and accept similar third-party panels and covers as for the KX
>> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
>> is the same height and depth as those. There is one USB port for
>> charging the internal lithium battery, and input and output stereo
>> jacks. The speaker is mono. The output jack redirects the right channel
>> from the stereo input for a second speaker, just like with the Elecraft
>> SP3 and other similar external speakers. The speaker is amplified.
>> 
>> The SPX3 puts out a maximum of 3W, and is about as loud as any external
>> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
>> PHONES jack. There is a built-in low pass filter to reduce noise and
>> improve the listening experience.
>> 
>> The prototype, as you'll see in pictures in the links below, is slightly
>> narrower than the expected finished product. The speaker driver and
>> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
>> case isn't. So, don't drop it in a lake. It will handle all conditions
>> appropriate for the KX3, and is meant for indoor and outdoor use. Having
>> matched the case design so closely to the KX3, it isn't as airtight as
>> I'd like it, so the next prototype will have the case halves join in a
>> more customary way, but remain the same dimensions and overall look.
>> This will also improve ingress protection.
>> 
>> You'll see the speaker is not a polished finished product yet, as it's a
>> rough first prototype made by hand. Your feedback will assure the final
>> product is what you want gracing your portable shack.
>> 
>> Please note, the KX3 in the photo is only to demonstrate the speaker.
>> 
>> All feedback is welcome. Please let me know which reasonable
>> enhancements or simplifications you'd like to see.
>> Examples:
>> * Would you want an output USB port to use the speaker to charge your
>> phone?
>> * Would you want to dispense with the built-in battery, and run it
>> entirely from external power?
>> * Would you want a second passive speaker driven by the first to save on
>> weight and cost? That is, a SPX3A (active, with battery, charger, and
>> amp) and SPX3P (passive, with only speaker driver)
>> * If you're a KX2 user, would you like me to produce the SPX2 (also in
>> development)?
>> 
>> Pictures:
>> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
>> SPX3 Left Oblique:
>> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
>> SPX3 Right Oblique:
>> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>> 
>> 73,
>> Robert (AG6ZZ)
>> 
>> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
>> J. Morris
>> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
>> Robert J. Morris
>> __
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft@mailman.qth.net
>> 
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>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to pvandyke1...@gmail.com
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Re: [Elecraft] [KX3] New Product: SPX3 External Speaker

[Paul Van Dyke]

I am interested .. the battery operation in interesting .. no usb for my phone


Paul  KB9AVO

On 4/12/18, Robert J. Morris  wrote:
> I've built a prototype powered external speaker for the KX3, and would
> like some feedback on what folks would desire in terms of features, and
> whether folks would want to own one.
>
> The speaker currently is designed to match the overall look of the KX3
> and PX3, and accept similar third-party panels and covers as for the KX
> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
> is the same height and depth as those. There is one USB port for
> charging the internal lithium battery, and input and output stereo
> jacks. The speaker is mono. The output jack redirects the right channel
> from the stereo input for a second speaker, just like with the Elecraft
> SP3 and other similar external speakers. The speaker is amplified.
>
> The SPX3 puts out a maximum of 3W, and is about as loud as any external
> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
> PHONES jack. There is a built-in low pass filter to reduce noise and
> improve the listening experience.
>
> The prototype, as you'll see in pictures in the links below, is slightly
> narrower than the expected finished product. The speaker driver and
> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
> case isn't. So, don't drop it in a lake. It will handle all conditions
> appropriate for the KX3, and is meant for indoor and outdoor use. Having
> matched the case design so closely to the KX3, it isn't as airtight as
> I'd like it, so the next prototype will have the case halves join in a
> more customary way, but remain the same dimensions and overall look.
> This will also improve ingress protection.
>
> You'll see the speaker is not a polished finished product yet, as it's a
> rough first prototype made by hand. Your feedback will assure the final
> product is what you want gracing your portable shack.
>
> Please note, the KX3 in the photo is only to demonstrate the speaker.
>
> All feedback is welcome. Please let me know which reasonable
> enhancements or simplifications you'd like to see.
> Examples:
> * Would you want an output USB port to use the speaker to charge your
> phone?
> * Would you want to dispense with the built-in battery, and run it
> entirely from external power?
> * Would you want a second passive speaker driven by the first to save on
> weight and cost? That is, a SPX3A (active, with battery, charger, and
> amp) and SPX3P (passive, with only speaker driver)
> * If you're a KX2 user, would you like me to produce the SPX2 (also in
> development)?
>
> Pictures:
> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
> SPX3 Left Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
> SPX3 Right Oblique:
> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>
> 73,
> Robert (AG6ZZ)
>
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
> J. Morris
> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
> Robert J. Morris
> __
> Elecraft mailing list
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to pvandyke1...@gmail.com
>
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[Elecraft] [KX3] New Product: SPX3 External Speaker

[Robert J. Morris]

I've built a prototype powered external speaker for the KX3, and would
like some feedback on what folks would desire in terms of features, and
whether folks would want to own one. 

The speaker currently is designed to match the overall look of the KX3
and PX3, and accept similar third-party panels and covers as for the KX
line. Presently, it uses the same legs and feet as the KX3 and PX3, and
is the same height and depth as those. There is one USB port for
charging the internal lithium battery, and input and output stereo
jacks. The speaker is mono. The output jack redirects the right channel
from the stereo input for a second speaker, just like with the Elecraft
SP3 and other similar external speakers. The speaker is amplified. 

The SPX3 puts out a maximum of 3W, and is about as loud as any external
radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
PHONES jack. There is a built-in low pass filter to reduce noise and
improve the listening experience. 

The prototype, as you'll see in pictures in the links below, is slightly
narrower than the expected finished product. The speaker driver and
on/off switch are both waterproof, but - just like the KX3 and PX3 - the
case isn't. So, don't drop it in a lake. It will handle all conditions
appropriate for the KX3, and is meant for indoor and outdoor use. Having
matched the case design so closely to the KX3, it isn't as airtight as
I'd like it, so the next prototype will have the case halves join in a
more customary way, but remain the same dimensions and overall look.
This will also improve ingress protection. 

You'll see the speaker is not a polished finished product yet, as it's a
rough first prototype made by hand. Your feedback will assure the final
product is what you want gracing your portable shack. 

Please note, the KX3 in the photo is only to demonstrate the speaker. 

All feedback is welcome. Please let me know which reasonable
enhancements or simplifications you'd like to see.
Examples:
* Would you want an output USB port to use the speaker to charge your
phone?
* Would you want to dispense with the built-in battery, and run it
entirely from external power?
* Would you want a second passive speaker driven by the first to save on
weight and cost? That is, a SPX3A (active, with battery, charger, and
amp) and SPX3P (passive, with only speaker driver)
* If you're a KX2 user, would you like me to produce the SPX2 (also in
development)? 

Pictures:
SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
SPX3 Left Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
SPX3 Right Oblique:
http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG 

73,
Robert (AG6ZZ) 

SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
J. Morris
SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
Robert J. Morris
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