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I too did not install any sound deadening except under the floor in the
vecinity of the exhaust pipes to save weight.  For several years just plain
Sigtronics did the job until I started takeing some longer trips due to the
NWA strike. The old sets were getting uncomfrotable after two hours of
flight .  So, I recently bought a pair of LightSpeed headsets which I found
to be comfortable plus they cancelled out the low freq roar.  I can highly
recommend them and they are under $300 too. I had a chance to try them on a
3+00 going and  2+40 return MSP-DEN flight and what an improvement in
comfort.

Jim Frantz
Jim@angle-of-attack.com