Luke Scharf wrote:

2. Do the numbers in the sales-literature mean anything in real life?

Dave S responded:

Turning on the ANR is like cutting the wire to the stereo's
subwoofer.. it takes a LOT of the lower frequency noise out..

Correct.

.... and yea.. the effect is additive.. you can add passive to active
dB suppression.

Only when measured at the same frequency. For a full explanation of
this issue, see my post on "$259 headsets" from March 20th, 2001 to
rec.aviation.homebuilt.

--
Marc J. Zeitlin
http://marc.zeitlin.home.comcast.net/
http://www.cozybuilders.org/
Copyright (c) 2005