[Elecraft] K3: CM500 vs. SB40

[Michael Blake]

I do own and use Yamaha CM500 headsets on both my KX3 and my K3s.  The CM500 is a wonderful headset!  When I don't need a mic I also use Bose QC25 noise cancelling headsets.

I am also a hearing aid user and both the Bose and Yamaha headsets are large enough to include my BTE hearing aids within the earcups.  Works well.  If your hearing aids have built in Telecoils (for magnetic pickup) the earphone drivers in the CM500 are unshielded and provide the necessary magnetic drive for the hearing aid's Telecoil pickup.  In this mode the CM500 is PERFECT!

Very 73 - Mike - K9JRI


On Mar 21, 2018, at 08:49 AM, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:

I've not use a CM-500 but I do have and use the SB-40.  I have different 
EQ values programmed for the SB-40 as compared to the Shure SM-58 which 
I use.   Both, being dynamic mikes,  get great audio reports.

The issue with the SB-40, being a dynamic mike, if it is too close to 
the mouth it sounds a bit bottom heavy.    With most dynamic mikes, 
mike-to-mouth distance is very important.  To close = too much bottom 
end.  With the SB-40 about 2" from the mouth and about mid lip/chin 
level I find to be best.  Don't get it up high above the mouth as 
breathing through the nose will be noticed.

73

Bob, K4TAX


On 3/20/2018 10:54 PM, elecraft-request at mailman.qth.net wrote:
Subject: Re: [Elecraft] K3: CM500 vs. SB40
Message-ID: <9A862635E05A4F9FA3EB35C7737539E3 at Toshiba>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
       reply-type=original

The SB-40, with its dynamic mic element, has a lot of bad
reviews on Amazon regarding mic audio quality, so I never have
tried it.

The Koss SB-45 on the other hand, with its electret element,
sounds great, and is very comfortable and affordable. I prefer
it over my Yamaha CM500 because it has a nice padded headband
that doesn't abrade my bald head like the rough webbing on the
CM500.

So how is the SB-40 working for you? Are you happy with the
sound in the monitor, and with on the air reports?

Dave Hachadorian, K6LL
Yuma, AZ


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