I tried the Koss SB45 and hated it. It sat on top of my ears instead of around 
them, unlike the CM500. Very uncomfortable. I returned them and got a new CM500 
headset. Here is a blog post comparing the two.

https://observer.wunderwood.org/2021/01/27/koss-sb-45-vs-yamaha-cm500/ 
<https://observer.wunderwood.org/2021/01/27/koss-sb-45-vs-yamaha-cm500/>

On the cheap side, because we are hams, the Koss CS100 looks like it should 
work fine for $15 (dual plug model).

https://www.amazon.com/Koss-CS100-Recognition-Computer-Headset/dp/B00C121ZOK?th=1
 
<https://www.amazon.com/Koss-CS100-Recognition-Computer-Headset/dp/B00C121ZOK?th=1>

Amazon says “dynamic element”, but Koss says it is an electret mic.

https://koss.com/products/cs100 <https://koss.com/products/cs100>

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

> On Nov 2, 2022, at 7:46 AM, Pete Smith N4ZR <pete.n...@gmail.com 
> <mailto:pete.n...@gmail.com>> wrote:
> 
> The Koss SB45 has been tested by several CM500 users, alarmed by the 
> potential loss of supply.  Works FB!
> 
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at<https://reversebeacon.net <https://reversebeacon.net/>>.
> For spots, please use your favorite
> "retail" DX cluster.
> 
> On 11/2/2022 10:43 AM, k...@comcast.net <mailto:k...@comcast.net> wrote:
>> Not sure about the manufacturing aspect but still available from amazon,
>> sweetwater, etc.
>> Hank / KR7X
>> 
>> -----Original Message-----
>> From:elecraft-boun...@mailman.qth.net 
>> <mailto:elecraft-boun...@mailman.qth.net>  <elecraft-boun...@mailman.qth.net 
>> <mailto:elecraft-boun...@mailman.qth.net>>  On
>> Behalf ofj...@kk9a.com <mailto:ofj...@kk9a.com>
>> Sent: Tuesday, November 1, 2022 9:57 PM
>> To:elecraft@mailman.qth.net <mailto:elecraft@mailman.qth.net>
>> Subject: Re: [Elecraft] Recommendation for Microphone for K3s?
>> 
>> Is the Yamaha CM500 still being manufactured?
>> 
>> John KK9A
>> 
>> 
>> Rick NK7I wrote:
>> 
>> They're nothing special; you can dial in equalization just as well in the
>> K3S.  I bought the Heil with my K3 and quickly gave up on them.
>> 
>> The Yamaha CM500 plugs into the rear (with bias) and the headphones are
>> comfy for hours, without spending a lot (by comparison, you can get a few
>> for the cost of one Heil).  They block most of the noise in my shack.  I
>> keep a couple spares as the foam covers do wear out.
>> 
>> If you need to block of lot of shack noise, there are other options, most
>> are expensive.
>> 
>> A search of the archives is recommended, this topic has been covered many
>> times before.
>> 
>> 73,
>> Rick nk7i
>> 
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