My wife bought a pair of Sennheiser PXC 250 for her iPod. They're
actually pretty nice, but I swear that they're not really noise
cancelling--I think that the electronics just adds a bit of white
masking noise and turns up the volume five or ten dB. Does anyone know?
Sennheiser's ad copy is that they have "NoiseGard active noise
compensation."

David (who is still using passives in the plane, cheap, cheap)

Nik wrote:
Got my QFRXCc headset 3 days ago and now I tested it for 5 hours in a
citabria.
As a young pilot, the Bose X semmend like an awesome headset however
$1000 is just too much money to spend for me. I looked around and found
the QFRXCc for $230 retail! I finally decided that in case I wasn't
happy with I would just return it.

Anyways, flying with it was just great, the best $230 I have ever
spent!! Passive anutation is great but the magic comes when you turn
the ANR on, I could not believe the difference the ANR made by
switching it ON and OFF.
The headset doesn't clamp at all, after flying 2 hours and 3 hours my
head does not hurt. Compare to the Bose X, I think the headset is
holding up pretty well. The Bose is still quieter but also almost 5x as
expensive.

The power for the ANR is supplied by 2x AA batteries in the battery box
which also has two sliders to control volume in each speaker; it also
has an aux plug to connect your mp3 player or cell phone! Great Headset
I absolutely love it!

-Nik