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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.
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.
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.
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.
On May 29, 2019 5:39:42 PM Jim Stone via Shop-talk
<shop-talk@autox.team.net> wrote:
> "While I'd love to have a pair of Bose Quiet Comfort 20â?¦â??
> Just for what its worth, I am on my third set of the Bose QC20â??s and could
> not live without them. They work incredibly well, but I donâ??t 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 canâ??t actually
> perceive it. Does anyone here know?
>
>
> _______________________________________________
>
> Shop-talk@autox.team.net
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<div dir=3D"auto">
<div dir=3D"auto">ANR - Active Noise Reduction - indeed does protect hearin=
g. The units vary in sophistication, but all essentially have a micro=
phone in each earcup that "listens" to the sound inside. The circuitr=
y of course knows what it's putting out (assuming this is an actual audio h=
eadset and not just a hearing protector) and ignores that. It generat=
es an opposite-phase sound wave to whatever it "hears" as noise, and thus t=
he noise and the ANR signal cancel each other. Your ear received less=
sound pressure.</div><div dir=3D"auto"><br></div><div dir=3D"auto">I have =
a pair of Peltor muffs for shooting with microphones in front so that you c=
an 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 a=
nd they're more quiet.</div><div dir=3D"auto"><br></div><div dir=3D"auto">I=
also have aftermarket ANR kits I installed in several of my aviation heads=
ets and they're far more effective even for mowing. But the price dif=
ference is huge. The Peltor ANR muffs were about $50, while the ANR k=
its I put in my David Clark headsets cost over $100, on top of a few hundre=
d dollars for the headsets themselves.</div><div dir=3D"auto"><br></div><di=
v dir=3D"auto">David Clark sells headsets with ANR from the factory, but th=
ey're over $500, and Bose aviation headsets are about $1,000. Ear plu=
gs are cheaper if they're satisfactory.</div><div dir=3D'auto'><br></div>
<div id=3D"aqm-original" style=3D"color: black;">
<!-- 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"color: black;=
">
<p style=3D"color: black; font-size: 10pt; font-family: sans-serif; margin:=
8pt 0;">On May 29, 2019 5:39:42 PM Jim Stone via Shop-talk <shop-talk@a=
utox.team.net> wrote:</p>
<blockquote type=3D"cite" class=3D"gmail_quote" style=3D"margin: 0 0 0 0.75=
ex; border-left: 1px solid #808080; padding-left: 0.75ex;">
<span style=3D"color: #0432ff;">"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 Bo=
se QC20=E2=80=99s and could not live without them. They work incredib=
ly well, but I don=E2=80=99t know if they qualify as hearing protection. &n=
bsp;As I understand it, they work by generating anti-noise: the opposite wa=
ve 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 sy=
stems - I wonder if they actually prevent hearing damage. It would b=
e 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 an=
yone here know? </div><div class=3D""><div><br class=3D""></div><br c=
lass=3D""></div>
<div>_______________________________________________</div>
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