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The comment about the "crystal radio" in the headsets is the most likely
source. Do turn off the headset ANR power and if the am/fm signals cease,
you have found the problem. It is not uncommon for a poor solder
junction, or non-diode component, to begin acting like a diode, which is
what a crystal radio crystal is. When they learned to make them work
constantly, they were called "crystal diodes" at the beginning of the
solid state era. I suspect that you will have to send the headset back to
Bose to have them seek out the part of the headset circuit board that is
working as a crystal detector (the detector is the part of every radio
that decodes the voice signal off of the radio signal). Any good radio
man should be able to trace the signal to its source, but Bose knows
their product and can repair or replace the defective part or circuit
board without a hassle, which is not true of the average radio shop or
hotshot radio amateur like yours truly.

Don't take no for an answer, this can be fixed and should be.

Bob Grossmann LNC2 #28 and still building.

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.