Using headphones that block external sound becomes a trade off. Effective noise
cancelling headphones tend to be heavy and bulky. That's fine for the casual
user but become uncomfortable after a long period of time. Contest users beware.
I had replaced my Heil boom headset with the CM500 and have been extremely
satisfied. The microphone has outstanding sound quality, they block most of the
external noise and most importantly they can be worn for long periods of time
without discomfort. They do not seem to be affected by RF.
At around $60 I believe that they are a great bargain and would recommend them
to all operators that require a boom mic/headset.
Good contesting,
Larryn7dd
-----Original Message-----
From: Jim Brown <k9yc@audiosystemsgroup.com>
To: cq-contest <cq-contest@contesting.com>
Sent: Wed, 21 Nov 2018 19:23
Subject: Re: [CQ-Contest] CM-500 headset
On 11/20/2018 4:57 PM, Art Boyars wrote:
> Do you have any experience or other info about the CM500's effectiveness in
> blocking external sound?
Mics reject "external sound" two ways -- by virtue of directivity, and
by inverse square law (that is, distance from the sound source). Most
room noise we hear on the air is the result of mic gain being turned up
much too high, combined with excessive compression. Good EQ settings
that maximize talk power by cutting low frequencies and slightly
emphasizing 2-3 kHz do a lot to reject room noise.
As near as I can tell, the mic in the CM500 is not directional. Nearly
all directional mics are cardioids, which are essentially half-space
mics. At best, they reject no more than 3-6 dB of room noise.
73, Jim K9YC
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