Thomas Borchert wrote:

/snip/. But ANR is not really effective at
high frequencies while passive isn't at low frequencies. So the headset
needs a balance between the two.


Thomas,
Not necessarily true, at all. The ANR function can be tuned to any
frequency, as desired. The Telex ANR-850's that I use in the jet are
FANTASTIC at reducing high-frequency wind noise, but are totally useless
in any propeller driven aircraft.

Happy Flying!
Scott Skylane