Re:  "Is there such a thing as a noise cancelling black box you can plug in 
aheadset such as the CM-500 and get good noise canceling? No knobs. Just 
anON-OFF switch like the headsets have."

Well, sort of, Tony.  In the aviation world,  conversions kits have been 
marketed for popular (in aviation circles) headsets to convert them to noise 
canceling.  They weren't "black box" plug-in devices, but rather a kit of 
microphones and electronics mounted in each earpiece and required some 
disassembly of the existing earpieces.  I believe they were made for David 
Clark and Flightcom headsets, and maybe a few others.  The result was a 
significant improvement over the original passive headsets, but not as good as 
a good pair of noise canceling headsets.  I don't know if they are still 
available.  I suspect the low end of the noise canceling headset market has 
displaced them.        

Mark
KE6BB


From: N2TK, Tony<tony....@verizon.net>
Sent: ‎Thu, ‎Dec‎ ‎26‎, ‎2013 at ‎5‎:‎20‎ ‎AM
To:  <Elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Noise Cancelling Headphones

Is there such a thing as a noise cancelling black box you can plug in aheadset 
such as the CM-500 and get good noise canceling? No knobs. Just anON-OFF switch 
like the headsets have.And thinking of the CM-500. Has anyone found a set of 
material covers thatfit their ear covers? I would think they would be more 
comfortable than theplastic against your head. And they would look better than 
the pieces ofpaper towels I presently use when wearing the headphones for 
extendedperiods. :-)73,N2TK, Tony-----Original Message-----From: 
elecraft-boun...@mailman.qth.net[mailto:elecraft-boun...@mailman.qth.net] On 
Behalf Of Gary SmithSent: Thursday, December 26, 2013 2:58 AMTo: 
elecr...@mailman.qth.netSubject: Re: [Elecraft] Noise Cancelling HeadphonesI 
use the Bose QC-15 as about all I do is CW and the audio on these iswonderful. 
The noise cancelling though is almost 100% perfect; my old Alphawith its blower 
is 18" from my head and with the QC-15 on I can't but just
 barely tell the amp is on or off. I was thinking about getting a headset with 
a mic & though Bose does makethe A20 for pilots, at $1100 for what is 
essentially the QC-15 with a boommic, I'll pass. They do make a A100T snap on 
mic for theQC15 but they are $250 for just the mic. I was referred by quite a 
fewpeople here to check out the Yamaha CM500 for a fine mic, quick match to 
theK3 and comfortable headsets & at $59. I'm so happy with the Bose QC15 that 
I'm going to keep using these and amgoing to need to figure out another way to 
get a mic into theK3 in a way that will be convenient for contesting should I 
ever decide todo a phone contest. I have an Electrovoice RE-10 which would 
probably benice & needs no power & maybe I can make a clamp-on boom that I can 
remove from the desk once the contest is over. I also have several condenser 
mics but they are for recording and would be excessand just problematic for ham 
use.Anyone have any suggestion of a
 removable boom mic other than the A100T thatwill attach to the QC-15 and make 
it simple to use and then remove when thecontest is over? I don't want to use 
velcro.Thanks & 73,GaryKA1J---This email is free from viruses and malware 
because avast! Antivirusprotection is 
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