This was discussed in the original string. The KX2 and KX3 have 100 mW per channel of audio out the phones jack. The K3S is 2.5 W/channel.
I use this 15 W per channel stereo audio amp with my KX3. The cost fluctuates between $8 and $13 for no obvious reason. It is a deal at either end of the price range. https://smile.amazon.com/gp/product/B00C4MT274/ <https://smile.amazon.com/gp/product/B00C4MT274/> wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Feb 14, 2017, at 1:13 PM, Ron D'Eau Claire <r...@cobi.biz> wrote: > > It's likely the KX1 or KX2 have much lower audio power available than your > K3S. > > 73, Ron AC7AC > > -----Original Message----- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of > efortner > Sent: Tuesday, February 14, 2017 12:35 PM > To: 'stan levandowski'; Elecraft@mailman.qth.net > Subject: Re: [Elecraft] (OT) Follow-up on CW Resonant Speaker > > Stan, > > I have built three of the resonant speakers per the QST article. I am using > a K3s and have plenty of audio without an amplifier. The three speakers were > all in the ballpark of 700 Hz. I took a 2 inch coupling and put on the > street elbow and it resonates at about 500 hz. There might be slightly more > audio coming out of the external speaker but when the resonant speaker is > switched on the noise level drops enough to be noticeable so the project was > worthwhile. > > Earl, K4KAY > > -----Original Message----- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of stan > levandowski > Sent: Monday, February 13, 2017 7:49 PM > To: Elecraft@mailman.qth.net > Subject: [Elecraft] (OT) Follow-up on CW Resonant Speaker > > Folks, I posted about having built the CW Resonant Speaker in the February > 2017 and having problems with low audio. This is a follow-up report for > those with interest in this subject. > > It works! It's fabulous! It's unbelievable how great it sounds! CW pops > out and background noise is significantly reduced. > > > I built it EXACTLY as described in the article and ordered the EXACT parts > listed. My problem was not enough audio coming from either my KX1 or my KX2 > headphone jacks. > > > I purchased a fully assembled 15 watt mono amplifier - Qianson TDA2030A 15W > Mono Channel Audio Power Amplifier Board AC/DC 12V AMP Module - Amazon for > $11.80. > > > With the new amp, my speaker is acoustically resonant at 760 Hz and I have > plenty of volume; enough to fill the room. The author had claimed "around > 700 Hz" so it's in the ballpark. I can verify that the construction article > was accurate. > > > I wanted 600 Hz so I built a vinyl sleeve to insert into the street elbow > and set my sidetone pitch for 600 Hz then slid the sleeve up and down until > I got a very obvious peak in volume. > > > I'm still a "can fan" for serious CW operating, but it's nice to be able to > listen to sweet CW that pops right out now that the higher frequency sounds > are substantially subdued. > > > This was a really worthwhile little project. > > > 73, Stan WB2LQF > ______________________________________________________________ > 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 efort...@ctc.net > > ______________________________________________________________ > 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 r...@elecraft.com > > ______________________________________________________________ > 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 wun...@wunderwood.org ______________________________________________________________ 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
