Hi,
Don't know for sure about Peltors, but the fault could be with the aircraft COM setup or with either of the headsets. Electical output circuits are designed with a particular impedance value in mind as the load. If this is either too high or too low you can get less than adequate power transfer, or poor performance of the COM system's output amplifier, or a problem with the Intercom system, possibly leading to the symptoms described.
I think you should try:
a) your new headsets in another aircraft with someone else to see if it happens again;
b) your instructors headsets likewise.
Try to determine if the problem always stays with the same headset or always stays with the same aircraft... then you'll know!
If in doubt, get an avionics engineer to look into it.
Hope this helps,
Last edited by Aussie Andy; 4th Jul 2002 at 17:18.