Re: [Elecraft] Diversity speaker set for sale
On 4/18/2022 12:06 PM, Walter Underwood wrote: Well, I did have a problem with my Hafler DH-220 providing enough current to my 2 Ω Magneplanars for the O-Daiko drum (biggest taiko drum). Had to turn it down. But that kind of bass is unlikely to be a problem with communications audio. And my son has the Maggies now, plus I’m currently replacing the power supply in the Hafler. Exactly my point. 73, Jim K9YC __ 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 Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Diversity speaker set for sale
Speakers are spoken for, thanks for the offers. Steve kz1x __ 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 Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Diversity speaker set for sale
> On Apr 18, 2022, at 11:45 AM, Jim Brown wrote: > > FALSE! Impedance matching has not been practiced in audio for at least 60 > years -- it dates to the days of vacuum tube output stages. There's nothing > wrong with using 2 ohm speakers with gear rated 4-8 ohms -- indeed, they will > play a bit louder for the same volume setting! Well, I did have a problem with my Hafler DH-220 providing enough current to my 2 Ω Magneplanars for the O-Daiko drum (biggest taiko drum). Had to turn it down. But that kind of bass is unlikely to be a problem with communications audio. And my son has the Maggies now, plus I’m currently replacing the power supply in the Hafler. These drums: https://www.youtube.com/watch?v=C7HL5wYqAbU wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) __ 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 Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Diversity speaker set for sale
On 2022-04-18 11:45, Jim Brown wrote: On 4/18/2022 11:21 AM, KENT TRIMBLE wrote: Many found at hamfests are 2 ohm speakers while amateur receivers and transceivers for the last 60 years have required 4-8 ohm speakers. FALSE! Impedance matching has not been practiced in audio for at least 60 years -- it dates to the days of vacuum tube output stages. There's nothing wrong with using 2 ohm speakers with gear rated 4-8 ohms -- indeed, they will play a bit louder for the same volume setting! *** In fact, I seem to remember a feature of good audio amps - "damping factor". It's basically a measure of how low-low-low - much lower than the speaker impedance - the output impedance of the amp is. A good damping factor helps control inertia effects in the speaker cone - helps give you "tight bass". - Jerry KF6VB __ 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 Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Diversity speaker set for sale
On 4/18/2022 11:21 AM, KENT TRIMBLE wrote: Many found at hamfests are 2 ohm speakers while amateur receivers and transceivers for the last 60 years have required 4-8 ohm speakers. FALSE! Impedance matching has not been practiced in audio for at least 60 years -- it dates to the days of vacuum tube output stages. There's nothing wrong with using 2 ohm speakers with gear rated 4-8 ohms -- indeed, they will play a bit louder for the same volume setting! There is usually a marking on the magnet face indicating the impedance. While I've modified several 2-ohm units to a higher impedance, it's more fun to watch the expression of the flea-market guys as you pull out a Phillips screwdriver and open case after case looking for 4 and 8 ohm ones. All of this is totally un-necessary. 73, Jim K9YC __ 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 Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Diversity speaker set for sale
Everything Steve says about the Motorola HSN speakers is true with the following caution: Many found at hamfests are 2 ohm speakers while amateur receivers and transceivers for the last 60 years have required 4-8 ohm speakers. There is usually a marking on the magnet face indicating the impedance. While I've modified several 2-ohm units to a higher impedance, it's more fun to watch the expression of the flea-market guys as you pull out a Phillips screwdriver and open case after case looking for 4 and 8 ohm ones. 73, Kent K9ZTV On 4/18/2022 12:29 PM, inventor61 wrote: For Sale: matching pair of Motorola HSN6003B external speakers for K3 with diversity mode. These are the version of the classic Motorola communications speaker, designed for use on police motorcycles. Besides being waterproof, they have superior acoustic characteristics ... __ 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 Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Diversity speaker set for sale
For Sale: matching pair of Motorola HSN6003B external speakers for K3 with diversity mode. These are the version of the classic Motorola communications speaker, designed for use on police motorcycles. Besides being waterproof, which isn't a real need for use with the K3, they have superior acoustic characteristics, as well as a top-mounted cutoff switch and the superb factory mounting bracket. These two were purchased new, and then wired such that they connect via a standard 1/8" stereo splitter adapter (which I will include). Used them on my K3 in a smoke and pet free environment, until I had to re-do the shack and there was nowhere to place them. Plug-n-play for the new happy owner. $50 for the complete setup plus shipping, which I am guessing would be ~$17 USPS Priority Mail. Steve kz1x __ 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 Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
