I use the same Pyle speakers, mostly because they were cheap, but they sound 
OK. My RX EQ is flat.

With my KX3, I drive them with a $10 12V audio amp, because the phones output 
is 100 mW.

Details here:

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

wunder
Walter Underwood
wun...@wunderwood.org
http://observer.wunderwood.org/  (my blog)

> On Feb 5, 2018, at 12:23 PM, Joe Subich, W4TV <li...@subich.com> wrote:
> 
> On 2/5/2018 1:43 PM, James Wilson wrote:
>> Great for the K3 on SSB or CW. Not Hi-Fi for music but entirely
>> adequate. 
> 
> I've been using the Pyle PCB3 series "cube" speakers since well
> before the SP3 was introduced.  The Pyle speakers are spec'd at
> 90 - 20 KHz (about the same as the SP3) and are easy to drive
> as well.
> 
> I notice no difference in response between the speakers and my
> headphones (typically Yamaha CM500 but occasionally smaller,
> ear bud or "professional" Sony headphones) *HOWEVER* I have the
> K3 RX EQ set to roll off (-16 dB) the 50 and 100 Hz bands with
> a -6 dB roll off in the 200 Hz band for SSB/AM and with -16 dB
> at 50 Hz and -3 dB at 200 Hz for CW.
> 
> There is no issue for me with the roll off if/when I listen to
> AM or shortwave broadcast but I can certainly "flatten out" the
> response by changing the RX EQ to flat or even add a bit of low
> end boost if band conditions are quiet/no QRM.
> 
> 73,
> 
>   ... Joe, W4TV
> 
> 
> On 2/5/2018 1:43 PM, James Wilson wrote:
>> Bill,
>> Personally, I like the SP-3 speaker. I have two of them and,
>> compared with my Koss headphones, they both sound like
>> the headphones. Great for the K3 on SSB or CW. Not Hi-Fi
>> for music but entirely adequate. PLUS, they look good
>> in the K-Line.
>> Jim - W4RKS
>> ----------------------------------------
>>> In the real world, does the SP-3 exhibit well rounded frequency
>>> response? Or, is the response more directed for "communications use"?
>>> How is it for listening to AM broadcast? How does it do with the famous
>>> K3 hiss? How does it do with a less capable receiver (one without an EQ)?
>>> I am considering some station simplification, hence the SP-3. Currently,
>>> I am using the Behringer MS40 pair. Super sound, but quite large and do
>>> have an internal amp (I have experienced no RF problems).
>>> Bill W2BLC K-Line
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