I inquired about this a few months ago.

The CM-500 has an electret mic that everyone likes. The Koss SB-45 has a 
dynamic mic that some like and some don’t. Otherwise, they seem similar.

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

> On Dec 28, 2015, at 2:26 PM, Gary Gregory <[email protected]> wrote:
> 
> Seasons greetings one and all.
> 
> Has anyone used/using the Koss SB45 headsets on their K3?
> 
> I have the CM-500 and I am on my second set but again the padding is
> starting to deteriorate so before they look too ratty, figured I would get
> a backup and as the CM500 are not available in VK but the Koss SB45 are, I
> would appreciate any comments/advice the list may offer.
> 
> Just to let you all know, I love my Yamaha cm500 BUT, shipping cost from
> the US is really quite ridiculous these days and the AUD has fallen off a
> cliff and the parachute failed to open...:-)
> 
> The Koss SB45 are $69.00 AUD, free shipping. I like free...:-)
> 
> TIA
> 
> 73
> Gary
> 
> -- 
> 
> 
> 
> *Gary - VK1ZZ, K3NHLSkype: Gary.VK1ZZhttp://www.qsl.net/vk1zz
> <http://www.qsl.net/vk1zz>Motorhome Portable*
> *Miss Behavin'*
> 
> 
> *Elecraft K3KPA500FT  #18KAT500FT  #007*
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