I recently bought a Bose A20 headset and I've been using it in the 737. I really like the headset, it's comfortable, clear, and has good ANR.

The only problem is the ANR seems to have some kind of interference with the electrical system on the 737. I've tried two different headsets and both have the same issue.

Once the generators are brought online, and for the rest of the flight, I can hear a high frequency thrumming noise (I don't really know how better to describe it). The noise gets quieter if I turn my head sideways in the cockpit. Also, the noise is there even if the headsets are not plugged into the aircraft, but the ANR is on.

It's not that noticeable on the 900s, but on the older 800s it's really noticeable and very fatiguing on a 4-5 hour flight (have not been on a 700 with them yet). I've called Bose several times about it, and to their credit they sent me a replacement headset really quickly. Honestly I don't think it's a problem with the particular headsets but the Bose not playing well with the 737.

Has anyone else had these problems?