Noise Cancelling Headphones
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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<[hidden email]> Sent: Thu, Dec 26, 2013 at 5:20 AM To: <[hidden email]> 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: [hidden email][mailto:[hidden email]] On Behalf Of Gary SmithSent: Thursday, December 26, 2013 2:58 AMTo: [hidden email]: 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 active.http://www.avast.com______________________________________________________________Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:[hidden email] list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html______________________________________________________________Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:[hidden email] list hosted by: http://www.qsl.netPlease 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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On 12/26/2013 10:39 AM, Mark Petiford wrote:
> 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 headset Right. Successful noise cancelling requires that the resulting acoustic output AS COUPLED TO THE EAR CANAL precisely match the acoustic noise that GETS THROUGH THE HEADPHONES TO THE EAR CANAL (caps added for emphasis) in both magnitude and phase, and that the two acoustic signals are out of polarity. That means that the mic picking up the noise be very close to the headphones, the distance between the mic, the transducer, and the ear must be compensated, and the relative response, both magnitude and phase, must be precisely compensated. That's a VERY difficult design problem, and a really good solution is only practical when everything is built as an integrated package, with dedicated mic, headphone transducers, and electronics. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Jim Brown-10
Jim,
I'd worry about sudden surges of high-intensity audio. They happen even in the best families. Your ears could be badly damaged before you could yank the Etymotics out. I'd never, ever use in-ear headphones in a ham-rig setting. Oliver W6ODJ On 25 Jan. 2013, at 20:40 PM, Jim Brown <[hidden email]> wrote: > On 12/25/2013 8:22 PM, Randy Farmer wrote: >> The Radiosport RS 20 headphones are the way to go. They're not cheap, but they really do the job. They have NO electronic circuitry to give RFI problems, just 24 dB of noise reduction due to their excellent acoustic isolation. > > I tried them, and found them to be VERY VERY uncomfortable, to the point of being instruments of torture. I'm a contester, and often am in the chair for 20-30 hours in a weekend. I couldn't wear the Radiosport cans for an hour. > > I'd rate the acoustic seal of CM500s comparable to Sony MDR7506 / MDR-V6, all of which I've owned and like a lot. In other words, if you're not happy with the MDR-V6, you won't be happy with the CM500. :) I have heard that east coast contesters love the Bose noise cancelling headphones, but I've never heard them. I did try a pair of Sennheiser noise cancelling headphones almost 20 years ago, and they seemed to work, but I wasn't being critical, and that was 20 years ago. :) > > The best, and most comfortable, noise isolating headphones I know of are the Etymotic Research ER4-series in-ear earsets, I own two pairs, and wore out one of the cables. They come with 3-4 generic ear fittings, and I found one of them to work well for me -- good isolation and comfort. Cost was about $200 eight years ago when I bought them. The greatest isolation is achieved with custom ear molds, which you buy from an audiologist who fits them to your ear canal. > > 73, Jim K9YC > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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On 12/26/2013 11:06 AM, Oliver Johns wrote:
> I'd worry about sudden surges of high-intensity audio. YES -- this is why I consider turning off AGC a really bad idea, especially in a contesting environment where you have the RF gain cranked to copy a very weak station and a guy calls you with a signal well over S9. > They happen even in the best families. Your ears could be badly damaged before you could yank the Etymotics out. I'd never, ever use in-ear headphones in a ham-rig setting. Absolutely no difference between in-ear and circumaural to the extent that the transducers are linear. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Jim Brown-10
On 12/26/2013 11:02 AM, Jim Brown wrote:
> Successful noise cancelling requires that the resulting acoustic output > AS COUPLED TO THE EAR CANAL precisely match the acoustic noise that GETS > THROUGH THE HEADPHONES TO THE EAR CANAL (caps added for emphasis) in > both magnitude and phase, and that the two acoustic signals are out of > polarity. That means that the mic picking up the noise be very close to > the headphones, the distance between the mic, the transducer, and the > ear must be compensated, and the relative response, both magnitude and > phase, must be precisely compensated. That's a VERY difficult design > problem, and a really good solution is only practical when everything is > built as an integrated package, with dedicated mic, headphone > transducers, and electronics. That, and the miniaturization and customization involved, is why my hearing assistance devices (high-end Phonak behind-the ear hearing aids) cost $3000 per ear. I have yet to try conventional large-cuff headphones since I got those aids three plus years ago. I use a streaming audio adapter that Bluetooth-couples to the aids. It doesn't solve the noise problem but is more comfortable. That works with my K2 just fine! For data modes (RTTY/PSK/SITOR) I work "quiet room" (RX AF volume at minimum) and use the waterfall as my tuning aid. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Jim Brown-10
Jim,
It takes longer to gouge in-ear phones out of your ear canal than it does to fling off a pair of over-ear cans. That's the problem. A piece of radio gear may at any instant decide to go ballistic and produce a loud buzz or whistle that can damage you. Keeping the AGC on is not a certain protection. Oliver W6ODJ On 26 Jan. 2013, at 11:15 AM, Jim Brown <[hidden email]> wrote: > On 12/26/2013 11:06 AM, Oliver Johns wrote: >> I'd worry about sudden surges of high-intensity audio. > > YES -- this is why I consider turning off AGC a really bad idea, especially in a contesting environment where you have the RF gain cranked to copy a very weak station and a guy calls you with a signal well over S9. > >> They happen even in the best families. Your ears could be badly damaged before you could yank the Etymotics out. I'd never, ever use in-ear headphones in a ham-rig setting. > > Absolutely no difference between in-ear and circumaural to the extent that the transducers are linear. > > 73, Jim K9YC > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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On 12/26/2013 1:00 PM, Oliver Johns wrote:
> It takes longer to gouge in-ear phones out of your ear canal than it does to fling off a pair of over-ear cans. How do you know that? Have you tied both? I have, and I have NOT found this to be true. Further, I can grab the audio gain control as quickly as I can remove headphones. The simple solution is to set up and operate the radio so that it does not blast you with levels that can produce hearing loss. I worked many years in pro audio, and this is something all of us have had to be quite conscious of. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Charlie T, K3ICH
With my Bose QC2 phones, I've never noticed any diminution in the
quality of the desired signal. Full disclosure: I'm a CW guy. I have no idea how they perform on SSB. 73, Steve AA4AK On 12/26/2013 8:30 AM, Charlie T, K3ICH wrote: > I've never tried noise cancelling headphones, so my one question is, > does anyone detect ANY effect to the desired audio? In other words, > any "Noise-Blanker" effects or coloration of the audio? > I would suppose that, since they're designed for music, the noise > cancelling function is transparent, right? > > On the very few flights I've taken recently, I successfully used my > old Sony MDR-7506's. Maybe I don't know what I'm missing by NOT using > a noise cancelling set. > > 73, Charlie k3ICH > > > ----- Original Message ----- From: "Ron D'Eau Claire" <[hidden email]> > To: <[hidden email]> > Sent: Thursday, December 26, 2013 2:25 AM > Subject: Re: [Elecraft] Noise Cancelling Headphones > > >> True noise cancelling headphones will cut noise far, far beyond anything >> acoustic isolation from ear pads can accomplish. >> >> I have a pair of Audio-Technia QuierPoint ATH-ANC1. They are "on ear" >> types >> so I didn't recommend them to the person asking for ones that cover the >> ears. They are very comfortable for me. >> >> When I fly, as the roar and whine of the big jet engines invades the >> cabin, >> I just switch them on and all the racket becomes a quite background >> purr. >> >> I often wear them for the entire 11 hours from the west coast of the >> USA to >> Europe, even if I'm not listening to any programs. >> >> The active circuitry in true noise-cancelling phones inverts the sound >> arriving and so actually cancels it out. >> >> The circuit takes a few seconds to adapt so when the attendant brings my >> drink she has no trouble waking me. >> >> 73 Ron AC7AC >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> 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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by W4JBB
I appreciate all the replies.
I learned a couple of things: 1. Noise-cancelling technology is not cheap, and 2. It's probably best that I actually "audition" (I think that's what someone called it) the headphones. I really do not need anything that will accept a mic. I am about 90% CW, 7% data, and 3% voice. For the little that I am on voice, I have the MH2 mic. Most folks that responded recommended the Bose Quiet Comfort 15's. In reference to number 1 above, I really had no idea noise-cancelling headphones would be so expensive, but you get what you pay for. A review site I found was www.head-fi.org. The Bose QC15 were rated #3 and followed the Sennheiser HD 380 Pro (#1 and not sure if they're noise cancelling or sound blocking) and the PSB M4U 2 (#2). However, like eHam.net, it's all subjective - folks either like the headphones or don't and there's no analytical data to back up their findings. 73, Joel - W4JBB On 12/25/13, 4:16 PM, Joel Black wrote: > I am looking for a pair of noise cancelling headphones. > > I have a pair of Sony MDR-V6's that I love, but they do not have noise > cancelling capability and my wife's embroidery machine is severely > limiting my radio operations. > > I have already looked at the Yamaha CM500's because they come so > highly recommended on this group. If they're noise cancelling, I > cannot find that information about them. > > I want something that will last. The MDR-V6's have lasted at least 10 > years if not longer. I've only had to replace the earpads. > > I want something that *covers* my ear *not* something that sits *on* > my ear. Those that sit *on* my ears are uncomfortable after a very > short while. > > Merry Christmas and 73, > > Joel - W4JBB > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Iain MacDonnell - N6ML-2
Worth the money is personal taste perhaps. I tried several noise
cancelling headsets from the common passive variety with excellent sound-proofing to several with the electronic noise removal. Without a doubt the most comfortable and most effective headsets I compared were the Bose QC-2. That headphone had issues and was out of warranty. However, Bose will replace a failed headset out of warranty with the same or the next generation of headset for $100. I spotted for the new generation and these are lighter and at least as effective as the older Bose QC2. It's still worth my time to check out new ones in the off-chance something will beat the QC-15 but to date audio quality and ambient sound removal-wise, this is it. Gary KA1J > On Thu, Dec 26, 2013 at 10:21 AM, Phil Kane <[hidden email]> > wrote: > > On 12/26/2013 8:17 AM, iain macdonnell - N6ML wrote: > >> These have caught my eye at my local Costco recently: > >> > >> > http://www.costco.com/Sony-MDR-10RDC-Premium-Noise-Canceling-Headpho > nes.product.100083695.html > >> > >> but I keep reminding myself that I have too many headsets already > :) > > > > Is it worth 180 bucks? > > Maybe, if you operate in a noisy environment. The Bose QC15 that > others are raving about sells for ~$270 ! > > 73, > > ~iain / N6ML > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: > http://www.qsl.net/donate.html > --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by W4JBB
I know that here in Wisconsin, Bose has an outlet store in a nearby
mall. I assume you could try on a pair although I have not done so. On 12/26/2013 5:43 PM, Joel Black wrote: > I appreciate all the replies. > > I learned a couple of things: > > 1. Noise-cancelling technology is not cheap, and > > 2. It's probably best that I actually "audition" (I think that's what > someone called it) the headphones. > > I really do not need anything that will accept a mic. I am about 90% > CW, 7% data, and 3% voice. For the little that I am on voice, I have > the MH2 mic. > > Most folks that responded recommended the Bose Quiet Comfort 15's. > > In reference to number 1 above, I really had no idea noise-cancelling > headphones would be so expensive, but you get what you pay for. A > review site I found was www.head-fi.org. The Bose QC15 were rated #3 > and followed the Sennheiser HD 380 Pro (#1 and not sure if they're > noise cancelling or sound blocking) and the PSB M4U 2 (#2). However, > like eHam.net, it's all subjective - folks either like the headphones > or don't and there's no analytical data to back up their findings. > > 73, > Joel - W4JBB > > > > On 12/25/13, 4:16 PM, Joel Black wrote: >> I am looking for a pair of noise cancelling headphones. >> >> I have a pair of Sony MDR-V6's that I love, but they do not have >> noise cancelling capability and my wife's embroidery machine is >> severely limiting my radio operations. >> >> I have already looked at the Yamaha CM500's because they come so >> highly recommended on this group. If they're noise cancelling, I >> cannot find that information about them. >> >> I want something that will last. The MDR-V6's have lasted at least 10 >> years if not longer. I've only had to replace the earpads. >> >> I want something that *covers* my ear *not* something that sits *on* >> my ear. Those that sit *on* my ears are uncomfortable after a very >> short while. >> >> Merry Christmas and 73, >> >> Joel - W4JBB >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> 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:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- 73, Gary K9GS Greater Milwaukee DX Association: http://www.gmdxa.org Society of Midwest Contesters: http://www.w9smc.com CW Ops #1032 http://www.cwops.org ************************************************ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: Noise Cancelling Headphones
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In reply to this post by W4JBB
Several years ago I ordered StennHeiser on-ear noise-cancelling
headphones for reducing noise on aircraft. This was not a luxury purchase but following orders of my audiologist to protect my hearing "always" when flying. Previously, I had to remove hearing aids and insert foam ear-plugs, which meant I was totally deaf for any in-flight conversation. The StennHeiser's cost me about $150, and did reduce noise slightly, but were very uncomfortable to wear with hearaids. Removing hearing aids and I was back in my silent incommunicado world. So I bought the $300 Bose QC2 (QC15 were not made back then) with comfortable around-ear muff. This proved to be a good investment later when I upgraded to Phonac OTR hearing aids which would absolutely be incompatible with on the ear styles. I gave my StennHeiser to my then-new wife who only used them a couple times. I have not tried them in the noisy shack when I run the 8877 blower (because I am running eme digital modes which are a text mode). Soon I will be trying to run CW eme and the Bose may help a lot to minimize blower noise so I can copy extreme weak signals. BTW I have a pair of Sony MDR-V600 stereo headphones that have done good service for copying weak signals for over a decade. They are over the ear muffs which I must use with my OTR hearing aids. Recently, I have been playing with the NR settings of the K3 to find a good compromise with quieting vs distortion of sounds (F1-2 works fairly well for me as any distorting of sound makes it harder to understand speech). For weak CW cranking down the bandwidth to 100-Hz is the best vs NR. Definition: weak CW < -6 dB SNR...signal strengths about -170 dBm. 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Jim Brown-10
Thanks for all the feedback. I need to try out a pair of noise canceling
over the ear headset on both CW and SSB to see if it helps. 73, N2TK, Tony -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Jim Brown Sent: Thursday, December 26, 2013 2:03 PM To: [hidden email] Subject: Re: [Elecraft] Noise Cancelling Headphones On 12/26/2013 10:39 AM, Mark Petiford wrote: > 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 headset Right. Successful noise cancelling requires that the resulting acoustic output AS COUPLED TO THE EAR CANAL precisely match the acoustic noise that GETS THROUGH THE HEADPHONES TO THE EAR CANAL (caps added for emphasis) in both magnitude and phase, and that the two acoustic signals are out of polarity. That means that the mic picking up the noise be very close to the headphones, the distance between the mic, the transducer, and the ear must be compensated, and the relative response, both magnitude and phase, must be precisely compensated. That's a VERY difficult design problem, and a really good solution is only practical when everything is built as an integrated package, with dedicated mic, headphone transducers, and electronics. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Gary Smith-2
Besides comfort which is highly personal, I found two other performance issues
with noise canceling headsets. First, the cheaper ones hiss. This is hard to tell with demos at stores since they insist on making you listen with music on. The hiss drives me nuts on the quieter bands. Second, I found that to my ears some headphones make rtty diddles and cw sound wrong. I assume this is a weakness in the noise cancelation which doesn't like non music or non voice material. It annoyed me that bose was so premium priced and I went through several cheaper ones before finally getting a refurb qc15 at a bose outlet store. The headsets were Bose qc15 , best noise canceling, no hiss, comfortable Altec Lansing hissy, but usable iGo, not hissy, usable, not so comfortable, small ear cups No name from CVS, distorts tones, uncomfortable Sony MDR-NC22, in ear, noise canceling not too bad, I can't wear them for too long Logitech (no longer made model). Real nice, but broke after a few contests logitech Refunded entire purchase price. Yamaha cm500. No noise canceling, fairly comfortable, mic bracket is loose after Several years Heil proset. No noise canceling, not as comfortable as cm500 but better made Heil bm10, no noise canceling, on ear. Just for something different Heil proset plus, just don't like how it fits me. It is handy to have several choices and types of earphones, as changing from say headset to earbuds to on ear headphones helps you survive long contests as each rests, and ends up hurting, a different part of your ears/head. Mark. N2QT > On Dec 26, 2013, at 7:59 PM, "Gary Smith" <[hidden email]> wrote: > > Worth the money is personal taste perhaps. I tried several noise > cancelling headsets from the common passive variety with excellent > sound-proofing to several with the electronic noise removal. Without > a doubt the most comfortable and most effective headsets I compared > were the Bose QC-2. That headphone had issues and was out of > warranty. However, Bose will replace a failed headset out of warranty > with the same or the next generation of headset for $100. I spotted > for the new generation and these are lighter and at least as > effective as the older Bose QC2. It's still worth my time to check > out new ones in the off-chance something will beat the QC-15 but to > date audio quality and ambient sound removal-wise, this is it. > > Gary > KA1J > >> On Thu, Dec 26, 2013 at 10:21 AM, Phil Kane <[hidden email]> >> wrote: >>> On 12/26/2013 8:17 AM, iain macdonnell - N6ML wrote: >>>> These have caught my eye at my local Costco recently: >> http://www.costco.com/Sony-MDR-10RDC-Premium-Noise-Canceling-Headpho >> nes.product.100083695.html >>>> >>>> but I keep reminding myself that I have too many headsets already >> :) >>> >>> Is it worth 180 bucks? >> >> Maybe, if you operate in a noisy environment. The Bose QC15 that >> others are raving about sells for ~$270 ! >> >> 73, >> >> ~iain / N6ML >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: >> http://www.qsl.net/donate.html > > > > > --- > This email is free from viruses and malware because avast! Antivirus protection is active. > http://www.avast.com > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: Noise Cancelling Headphones
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In reply to this post by N2TK
And now its time to close this thread in the interest of containing list volume. :-)
73. Eric list moderator elecraft.com _..._ > On Dec 27, 2013, at 5:16 AM, "N2TK, Tony" <[hidden email]> wrote: > > Thanks for all the feedback. I need to try out a pair of noise canceling > over the ear headset on both CW and SSB to see if it helps. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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