For CW contests, I tried a pair of Direct Sound EX-29 "Extreme Isolation" headphones. They don't have a model with a boom mike.
I find them very isolating, but over a few hours I'm sweating under them a bit more than I'm comfortable with. They're great as part of the headphone rotation. I find that sometimes I can change headphones and stay in the chair longer than if I just stay with one headset. I prefer isolation to phase-cancelling noise reduction. Without any real knowledge of the acoustic science, I have an opinion that noise cancellation is yet another distortion, and it all adds up. Phase cancellation can't be perfect. I use noise cancelling headphones on airplanes and enjoy them for that purpose. The EX-29 headphones aren't the bargain that the Yamaha CM-500 is. 73 de Dick, K6KR -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bob Naumann Sent: Tuesday, March 02, 2010 7:29 PM To: 'Barry N1EU'; elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 - 'High Isolation Headphones' I have to agree with this follow-up with the exception that I think that the CM-500 is actually much better than Heil Pro-Set for isolation. For me, the key to this is the larger "muffs" that completely cover my ears. I used them on an Icom 7800 at NR5M in the ARRL CW contest, and they worked quite well. They are, without question, the best ham radio bargain I can recall since the Kenwood TS830 was introduced. 73, Bob W5OV -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Barry N1EU Sent: Tuesday, March 02, 2010 4:03 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 - 'High Isolation Headphones' AD4C2009 wrote: > > Well I spent this past weekend 18 hours in radio on saturday and sunday > with my Yamaha CM-500 on my head all the time,either on CW or SSB and felt > no tired,they are smooth and weight little in my head,isolation is > perfect. > I just wanted to post a follow-up message on this thread. I just acquired a CM500 headset - they seem to perform quite well but they can hardly be considered a high isolation headphone. The isolation is about the same as the Heil ProSet but falls far short of the Sennheiser HD280. The CM500 isn't really suitable if you follow the K3NA approach toward maximizing dynamic range with AGC off. On the other hand, the CM500 seems quite good indeed for normal operation with AGC on and the microphone gets great audio reports. 73, Barry N1EU -- View this message in context: http://n2.nabble.com/K3-High-Isolation-Headphones-tp4530272p4663966.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
