On Fri, 07 Nov 2003 21:00:15 GMT, "Joe Strain"
wrote:

Can you use them at the pistol range for LOUD transient-noise supporession ?
Yodar
Not very useful. There are two limitations in the technology.
1). It is most effective against continuous noise. Impulse type noise
is more difficult to deal with. That is one of the reasons they work
so well on aircraft, and high end units use very advanced 'predictive'
cancellation to aciheve electronic cancellation in the 18-22db range
(and it works quite well, I have a Telex ANR-1D headset, and it truly
silences the prop noise in a light aircraft. (Between active and
passive cancellation 40db, so it takes a real racket (about 102db) and
reduces it to about 62db. The biggest problem is often remember to
speak up enough to turn on the Intercom

2). Noise canellation can work only as long as the distance between
mic and headset is small compared to wavelength. The net effect is
that the effectiveness of noise cancellation falls off very rapidly
past about 1Khz.

"Ron Hardin" wrote in message
...
The new model is maybe slightly quieter than the original - hard to
say. It's not less quiet anyway. The improvement perceived might
just be a difference in the age of the cups, I don't know.

The _great_ advantage is there is no cord if you don't plug in a cord,
so you can use them for quiet without catching a cord on things. They
also seem lighter. On the other hand, you can lose the cord, I bet.

I used the old chiefly as a lawnmower deadener. The new should work
better for that.

New uses 1 AAA, old used 2.
--
Ron Hardin


On the internet, nobody knows you're a jerk.