Yes, the CM500 works just fine on the KX3. I recommend getting an off the shelf 
stereo splitter cable to get cleaner mic bias and to split out PTT. Details 
here.

https://observer.wunderwood.org/2015/08/16/yamaha-cm500-headset-with-ptt-on-elecraft-kx3/

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

> On Nov 2, 2022, at 9:50 AM, Ian Maude via Elecraft <[email protected]> 
> wrote:
> 
> 
> 
>> On 2 Nov 2022, at 16:19, Ian Maude <[email protected]> wrote:
>> 
>> Out of interest, can the CM-500 be used on the KX3?
>> 
>> 73 Ian
>> 
>>> On 2 Nov 2022, at 16:15, Bob McGraw <[email protected]> wrote:
>>> 
>>> Likewise, I'm a retired pro audio engineer, studio and live music.  The 
>>> CM500 is a very good headset and plugs directly into the rear of the K3S.  
>>> Turn on the bias.   They are available from Sweetwater Sound (no connection 
>>> to me) for about $60.  I also use the Koss SB40 ($29 on Amazon) which has a 
>>> dynamic mike.  One has to be careful with the mike-to-mouth placement as it 
>>> is a dynamic mike (no bias required) and thus is prone to proximity effects 
>>> or boosted low end.  Taking a different approach I use a Shure SM-58 ($100) 
>>> on a boom.  I did make my own XLR-3 to Foster 8 pin cable. Very easy to do 
>>> and connects to the front panel MIC connector.  No bias required.  I also 
>>> have used a Behringer XM8500 ($29) with very similar results as the SM-58.  
>>> The SM-58, or its like in wireless form,  is a very popular stage vocal 
>>> mike.
>>> 
>>> One factor I've observed and stressed is "proper microphone technique".  
>>> That is proper placement of the microphone with regard to the mouth.  I 
>>> find many hams have been taught incorrectly in this regard or perhaps do 
>>> not understand the relationship that exists.  One needs to experiment with 
>>> a specific mike and their voice in order to attain desired results.   Many 
>>> dynamic microphones will have proximity effect which will make them bottom 
>>> heavy or bassy.  Simply back the mike away from the mouth to correct the 
>>> concern.  Many microphones have extended high end response.  This produces 
>>> lots of lip and mouth and breath/nasal sounds.  Again, correct placement 
>>> above the mouth, or to the side or below the mouth usually corrects the 
>>> concern. And of course, proper adjustment of microphone gain and any 
>>> compression is mandatory with each mike.
>>> 
>>> Jim, K9YC recommendations for TX EQ is an excellent starting point.  In my 
>>> case, I've tweaked the numbers a wee bit to suit my voice and my microphone 
>>> choice.
>>> 
>>> Listen to your signal by recording it and then playing it back from the 
>>> various SDR remote receivers around the country.    That way you know how 
>>> your station sounds.
>>> 
>>> 73
>>> 
>>> Bob, K4TAX
>>> 
>>> 
>>> On 11/2/2022 9:44 AM, [email protected] wrote:
>>>> Message: 18
>>>> Date: Tue, 1 Nov 2022 17:48:31 -0700
>>>> From: Jim Brown<[email protected]>
>>>> To:[email protected]
>>>> Subject: Re: [Elecraft] Recommendation for Microphone for K3s?
>>>> Message-ID:
>>>>    <[email protected]>
>>>> Content-Type: text/plain; charset=UTF-8; format=flowed
>>>> 
>>>> I strongly agree with Rick's advice. I'm retired from pro audio, did
>>>> lots of live recording, still have some great pro mics, but I've been
>>>> using the CM500 since around 2009. I can't think of a better choice. I
>>>> find the headphones comfy enough for a long weekend contest, and they
>>>> sound great!
>>>> 
>>>> 73, Jim K9YC
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> 
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