[PVRCNC] CVS headphones

[Jim K4QPL]

Hi Guy,

Don't think they'll reduce much "prattle" which does not have a constant low 
frequency content. However, I think they would take out a lot of the amp and 
computer fans, as well as the exhaust fan, noise in Howie's radio room. I'm 
bringing my set down for ARDX and may look for another pair for Howie if he 
doesn't have a set already. I doubt if they'll do much vs. Scamp's barking 
either!

Your observations may have something to do with the response curve of the 
microphones that introduce the audio signal, and the audio circuits which 
process, the frequencies which are inverted and hence canceled. A rumble 
lower than the response of the mikes and audio circuit will not be 
processed. That could also be a part of a non linear response and "getting 
what you pay for."

73,

Jim


----- Original Message ----- 
From: "Guy Olinger" <Guy.Olinger at sas.com>
To: <PVRCNC at mailman.qth.net>
Sent: Friday, December 02, 2005 11:51 AM
Subject: RE: [PVRCNC] CVS headphones


I think there was one more pair behind the counter at the CVS at NC55 and 
Highhouse in western Cary.

I tried the pair that was given to me at the NCEast holiday meeting last 
night. Surprising reduction in ambients when they're on.

Certain sounds are reduced entirely, a few odd ones get through a bit. 
Intriguing why some sound would get completely cancelled and not others. 
Seems to have something to do with continuous tonality to the sound. Very 
low frequency rumbling comes through some.

Regardless, a very large reduction in ambients. Since I have two pair, am 
going to leave one of them at work, where sometimes the prattle can be very 
distracting.


-----Original Message-----
From: pvrcnc-bounces at mailman.qth.net [mailto:pvrcnc-bounces at mailman.qth.net] 
On Behalf Of Jim WW4M
Sent: Friday, December 02, 2005 11:33 AM
To: PVRCNC at mailman.qth.net
Subject: Re: [PVRCNC] CVS headphones

My store in Durham said they still have 3 sets behind the counter so I'm 
going to try them out tonight. FYI you can search for a store near you at 
http://cvsstore.geoserve.com/scripts/esrimap.dll?Name=L&Com=fo&Db=DLRCvs&Ds=Store

73, Jim WW4M

On 11/30/05, Roberts, Will <will.roberts at pgnmail.com> wrote:
> Anyone know of the CVS headphones being available in Raleigh? I love
> my Lightspeed noise cancellers, but they are too bulky for contesting,
> and very expensive (>$600). I'll take a $15 chance on some for radio
> and commercial flying. I have a $50 pair of Memorex NC phones that
> aren't too swift. I hope these are better.
>
> Thanks,
>
> Will
> _______________________________________________
> PVRCNC mailing list
> PVRCNC at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/pvrcnc
>
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