Like Don, I wear hearing aids (both ears) about 18-hours/day. I can choose a flat response setting (called music or TV) and use it for ham radio as it produces the crispest audio on voice. I found I prefer using an external speaker over the internal K3 speaker. The 10-inch National Speaker from the 1950's is hard to beat. I have not changed the default RX-EQ in my K3. Nor have I adjusted TX-EQ, but may roll off the low end and high end someday (Using the Heil HM10-5). I get great audio reports as it is.
I have the 2.8 and 400-Hz 8-pole filters. I find that the 400 works well for CW on HF bands and I can reduce bw with the DSP for weak-signal CW-eme. I have played some with narrowing bw on SSB and shifting the passband to both improve reception and reduce interference. NR works nice with signals of adequate strength. On very weak SSB it sometimes adds a bit of distortion which is not helpful. ------------------------------ Message: 53 Date: Mon, 04 Oct 2010 11:02:03 -0400 From: Don Wilhelm <[email protected]> Subject: Re: [Elecraft] Use of external speakers/amp To: Rick Stealey <[email protected]> Cc: [email protected] Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Rick, Some DSP based receivers are capable of producing great audio. Consider that CD audio is an implementation of DSP. How close to CD quality any practical receiver can come depends on the sampling rates and the number of bits in the A-D and D-A conversions. Inexpensive amplified speakers can sound bad, although some sound quite good. I would suggest using unamplified speakers with the K3 - I was able to pick up some old RS Optimus speakers and those are currently on my K3. I have also driven a good quality stereo receiver equipped with large stereo speakers - the K3 sounds good within the restrictions imposed by the highest frequency that the K3 audio will go - 4 kHz. You may be trying to straighten out a deficient speaker response with the K3 RX-EQ. I run my K3 with all the EQ settings at zero. Many speakers that are just speakers in a box (usually with an open back) will have many irritating peaks in their response curve. I prefer small Hi-Fi speakers over any of the speakers normally found with ham gear. Since Brian has suggested - yes, I wear hearing aids, but I normally listen with the response set for a flat response without noise reduction - my audiologist set up a special "music" program for me. 73, Don W3FPR 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-QRT*, 432-100w, 1296-QRT*, 3400-winter? DUBUS Magazine USA Rep [email protected] ====================================== *temp ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
