Originally Posted by
rickair7777
Telex 750 and Bose are good ANR headsets. The Bose provides max attenuation (good for noisy airplanes, but is bulky and requires batteries (you will be lost comms if your batteries die).
The Bose X headset is a TSO'd (technical standard order) product. It will continue to work, even if the batteries die. It will not, however, provide Active Noise Reduction (ANR), which in the CRJ's is no big deal. In a noisy turboprop, you're gunna have a bad day until you either get batteries or add ear plugs.
The microphone kits that are added to the Bose consumer ANR headset will cease to function without batteries.