David Clarke Reviews

In article ,
(Teacherjh) wrote:


My only issue with (DC) ENR is that I get a low frequency warble, probably
due
to a poor seal around the earpiece of my glasses.

I had that same problem, give them a call.

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html

My only issue with (DC) ENR is that I get a low frequency warble, probably
due to a poor seal around the earpiece of my glasses.

I had that same problem, give them a call.


What was your solution? I called them, they suggested and sent me (free) the
ear seals that go around the eyeglass earpieces and are supposed to improve the
seal. They did, a bit, but were fussy and I ended up just living with the
warble.

What happened with yours?

Jose


--
(for Email, make the obvious changes in my address)

In article ,
(Teacherjh) wrote:


I find ENR works on the higher frequencies too. I put on my DCs passively
and
can still talk to people around me. I flip on the ENR and it's like I've
gone
deaf.

Are you saying you can no longer hear people talking? I find the
opposite..using ANR allows me to hear the jumpers in the back of the 206
talking...to their surprise sometimes. G

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html

Are you saying you can no longer hear people talking?

Pretty much. I wear them (also) when I'm outside doing noisy stuff (running a
gas mower for example) and the quiet it produces is quite striking. If
somebody talks, whatever sound reaches the inside of the headset is cancelled
out by the ANR and I can barely hear them. It's great!

(of course if they are on an intercom in the plane, I hear them perfectly)

Jose

--
(for Email, make the obvious changes in my address)

Teacherjh wrote:


There is some question of the value of ENR (Electronic Noise Reduction)
in avoiding future hearing loss. Our company investigated supplying ENR
headsets in a high noise area, but decided not to, since there was no
demonstrated value. In short, ENR only works on lower frequencies, and
those frequencies typically don't affect hearing as much as higher
frequencies.


... and smoking hasn't been proven to cause cancer.

If you put them on, and it seems quieter (vs a non ENR set) then it's probable
that there is less noise entering the ear. This probably leads to less damage
(if we accept the premise that noise at that level causes damage).

Perhaps. The general consensus is that A weighted noise is what causes
hearing damage. That weighting scale drops off below about 1000 hz,
meaning that people don't readily hear low frequency noise. People tend
to feel low frequency noise more than hear it. The ENR systems
typically only work in those low frequency ranges, which is why it is
felt they have limited value in avoiding hearing loss, except in
extremely noisy, low frequency environments.

To put it in perspective, note that a two-bladed prop rotating at 2,000
RPM, will generate a noise frequency that is about four times the
maximum rate that the ENR systems work at.

I find ENR works on the higher frequencies too. I put on my DCs passively and
can still talk to people around me. I flip on the ENR and it's like I've gone
deaf.

It actually doesn't work at higher frequencies. If you read the
specifications for those systems, you will find that they typically
don't attenuate noise above about 500 or at max 1,000 Hz, which are both
low frequencies. The reason is that there is a risk of compounding
noise, instead of attenuating it, as the frequencies increase. What you
are finding with the ENR system is that it reduces the low frequency
noise and allows other sounds to come through more clearly.

My only issue with (DC) ENR is that I get a low frequency warble, probably
due
to a poor seal around the earpiece of my glasses.

I've struck this a lot with the newer revisions of the H10-13x - to be
honest, I think it's a design flaw. I had an earlier model that was
absolutely rock solid in every respect - but one of the later models was
sent back for repair 3 times before being replaced by a new pair - and guess
what - the new pair had the same tendency - not always but "never far away"
(with a good seal too).

In the end I switched to Bose.

That's why you should never rely on bean counters when it comes to
safety, security or comfort.

On Sun, 18 Apr 2004 18:56:10 GMT, James Robinson
wrote:

Pete Brown wrote:

With regard to ANC, don't even think about not getting it. I
know that it seems like an expensive option now when you are
starting out but if you continue to fly, you will find that
the upfront cost is nothing compared to the cost of hearing
aids that you will eventually need.

There is some question of the value of ENR (Electronic Noise Reduction)
in avoiding future hearing loss. Our company investigated supplying ENR
headsets in a high noise area, but decided not to, since there was no
demonstrated value. In short, ENR only works on lower frequencies, and
those frequencies typically don't affect hearing as much as higher
frequencies.

There were a couple of areas where there might have been some benefit,
but they were unquantifyable, so the company couldn't put a dollar value
on the systems. The use of the systems might have led in a possible
reduction in fatigue, resulting in improved alertness, and there might
have been improved clarity in conversations, reducing communication
error.

Stu Gotts wrote:

That's why you should never rely on bean counters when it comes to
safety, security or comfort.

It was actually the medical department that killed the program, not the
bean counters. The financial people would have been delighted if there
was any benefit, since payouts for occupational hearing loss are quite
high.

There is some question of the value of ENR (Electronic Noise Reduction)
in avoiding future hearing loss. Our company investigated supplying ENR
headsets in a high noise area, but decided not to, since there was no
demonstrated value. In short, ENR only works on lower frequencies, and
those frequencies typically don't affect hearing as much as higher
frequencies.

With DCs the passive attenuation is on par with other (non ANR) headsets.
The ANR is ADDITIONAL attenuation, with main benefits being increased
clarity of speech and less fatigue. They're really designed for aircraft
type noise levels (which in the big picture of things aren't really that
noisy inside) - they wouldn't be sufficient for such things as daily
chainsaw useage. If you need high frequency protection from relatively high
noise environments then an aviation type headset isn't the right tool for
the job.

James Robinson wrote:

Our company investigated supplying ENR
headsets in a high noise area, but decided not to, since there was no
demonstrated value. In short, ENR only works on lower frequencies, and
those frequencies typically don't affect hearing as much as higher
frequencies.

ANR can be designed to work on any frequency. I suggest your company might want to
check out the Bose ANR headphones (nonaviation). They seem to block out all
frequencies. Great hearing protectors in a noisy environment.

George Patterson
This marriage is off to a shaky start. The groom just asked the band to
play "Your cheatin' heart", and the bride just requested "Don't come home
a'drinkin' with lovin' on your mind".