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Thanks, Karl. That is good to know, although I will probably restrict =
use of my ear buds this way, simply due to their cost. I=E2=80=99ve =
ruined conventional earphones while working and don=E2=80=99t want to =
risk damage to the expensive QC20=E2=80=99s, especially when inexpensive =
solutions are available.
> On May 29, 2019, at 7:24 PM, Karl Vacek <stearman809@gmail.com> wrote:
>=20
> ANR - Active Noise Reduction - indeed does protect hearing. The units =
vary in sophistication, but all essentially have a microphone in each =
earcup that "listens" to the sound inside. The circuitry of course =
knows what it's putting out (assuming this is an actual audio headset =
and not just a hearing protector) and ignores that. It generates an =
opposite-phase sound wave to whatever it "hears" as noise, and thus the =
noise and the ANR signal cancel each other. Your ear received less =
sound pressure.
>=20
> I have a pair of Peltor muffs for shooting with microphones in front =
so that you can speak with someone and still be ready when a shot goes =
off. They're good, but for mowing the lawn I still turn off the sound =
from the microphones and they're more quiet.
>=20
> I also have aftermarket ANR kits I installed in several of my aviation =
headsets and they're far more effective even for mowing. But the price =
difference is huge. The Peltor ANR muffs were about $50, while the ANR =
kits I put in my David Clark headsets cost over $100, on top of a few =
hundred dollars for the headsets themselves.
>=20
> David Clark sells headsets with ANR from the factory, but they're over =
$500, and Bose aviation headsets are about $1,000. Ear plugs are =
cheaper if they're satisfactory.
>=20
> On May 29, 2019 5:39:42 PM Jim Stone via Shop-talk =
<shop-talk@autox.team.net> wrote:
>=20
>> "While I'd love to have a pair of Bose Quiet Comfort 20=E2=80=A6=E2=80=9D=
>>=20
>> Just for what its worth, I am on my third set of the Bose QC20=E2=80=99=
s and could not live without them. They work incredibly well, but I =
don=E2=80=99t know if they qualify as hearing protection. As I =
understand it, they work by generating anti-noise: the opposite wave =
length of the noise coming in. While what you can hear is greatly =
diminished - they are awesome on airplanes and in hotels with noisy HVAC =
systems - I wonder if they actually prevent hearing damage. It would =
be nice to know if they do qualify, or if noise+anti-noise is still =
damaging to the ears, even if you can=E2=80=99t actually perceive it. =
Does anyone here know? =20
>>=20
>>=20
>> _______________________________________________
>>=20
>> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
>> Suggested annual donation $12.96
>> Archive: http://www.team.net/pipermail/shop-talk =
<http://www.team.net/pipermail/shop-talk> http://autox.team.net/archive =
<http://autox.team.net/archive>
>>=20
>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/shop-talk/stearman809@gmail.com =
<http://autox.team.net/mailman/options/shop-talk/stearman809@gmail.com>
>>=20
>>=20
>=20
>=20
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D"">Thanks, Karl. That is good to know, although I will =
probably restrict use of my ear buds this way, simply due to their cost. =
I=E2=80=99ve ruined conventional earphones while working and =
don=E2=80=99t want to risk damage to the expensive QC20=E2=80=99s, =
especially when inexpensive solutions are available.<br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On May 29, 2019, at 7:24 PM, Karl Vacek <<a =
href=3D"mailto:stearman809@gmail.com" =
class=3D"">stearman809@gmail.com</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D"">
<div class=3D"">
<div dir=3D"auto" class=3D"">
<div dir=3D"auto" class=3D"">ANR - Active Noise Reduction - indeed does =
protect hearing. The units vary in sophistication, but all =
essentially have a microphone in each earcup that "listens" to the sound =
inside. The circuitry of course knows what it's putting out =
(assuming this is an actual audio headset and not just a hearing =
protector) and ignores that. It generates an opposite-phase sound =
wave to whatever it "hears" as noise, and thus the noise and the ANR =
signal cancel each other. Your ear received less sound =
pressure.</div><div dir=3D"auto" class=3D""><br class=3D""></div><div =
dir=3D"auto" class=3D"">I have a pair of Peltor muffs for shooting with =
microphones in front so that you can speak with someone and still be =
ready when a shot goes off. They're good, but for mowing the lawn I =
still turn off the sound from the microphones and they're more =
quiet.</div><div dir=3D"auto" class=3D""><br class=3D""></div><div =
dir=3D"auto" class=3D"">I also have aftermarket ANR kits I installed in =
several of my aviation headsets and they're far more effective even for =
mowing. But the price difference is huge. The Peltor ANR =
muffs were about $50, while the ANR kits I put in my David Clark =
headsets cost over $100, on top of a few hundred dollars for the =
headsets themselves.</div><div dir=3D"auto" class=3D""><br =
class=3D""></div><div dir=3D"auto" class=3D"">David Clark sells headsets =
with ANR from the factory, but they're over $500, and Bose aviation =
headsets are about $1,000. Ear plugs are cheaper if they're =
satisfactory.</div><div dir=3D"auto" class=3D""><br class=3D""></div>
<div id=3D"aqm-original" style=3D"" class=3D"">
<!-- body start -->
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
line-break: after-white-space;" class=3D"aqm-original-body"><div =
style=3D"" class=3D""><p style=3D"font-size: 10pt; font-family: =
sans-serif; margin: 8pt 0px;" class=3D"">On May 29, 2019 5:39:42 PM Jim =
Stone via Shop-talk <<a href=3D"mailto:shop-talk@autox.team.net" =
class=3D"">shop-talk@autox.team.net</a>> wrote:</p>
<blockquote type=3D"cite" class=3D"gmail_quote" style=3D"margin: 0 0 0 =
0.75ex; border-left: 1px solid #808080; padding-left: 0.75ex;">
<span style=3D"color: #0432ff;" class=3D"">"While I'd love to have a =
pair of Bose Quiet Comfort 20=E2=80=A6=E2=80=9D</span><div =
class=3D""><br class=3D""></div><div class=3D"">Just for what its worth, =
I am on my third set of the Bose QC20=E2=80=99s and could not live =
without them. They work incredibly well, but I don=E2=80=99t know =
if they qualify as hearing protection. As I understand it, they =
work by generating anti-noise: the opposite wave length of the noise =
coming in. While what you can hear is greatly diminished - they =
are awesome on airplanes and in hotels with noisy HVAC systems - I =
wonder if they actually prevent hearing damage. It would be nice =
to know if they do qualify, or if noise+anti-noise is still damaging to =
the ears, even if you can=E2=80=99t actually perceive it. Does =
anyone here know? </div><div class=3D""><div class=3D""><br =
class=3D""></div><br class=3D""></div>
<div class=3D"">_______________________________________________</div>
<div class=3D""><br class=3D""></div>
<div class=3D""><a class=3D"aqm-autolink aqm-autowrap" =
href=3D"mailto:Shop-talk%40autox.team.net">Shop-talk@autox.team.net</a></d=
iv>
<div class=3D"">Donate: <a class=3D"aqm-autolink aqm-autowrap" =
href=3D"http://www.team.net/donate.html">http://www.team.net/donate.html</=
a></div>
<div class=3D"">Suggested annual donation $12.96</div>
<div class=3D"">Archive: <a class=3D"aqm-autolink aqm-autowrap" =
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<div class=3D""><br class=3D""></div></blockquote>
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