I previously used DC 13.4's but have recently upgraded to Bose Aviation Headset X. I have to say the change is amazing and it has worked in all cockpits I have flow in. It has even worked in a Pitts (2 flights with the Bose now) and is much quiter than the 13.4's previously used. Plus they are ultra comfortable and I am not dissapointed in having paid the rather high price for them.
Cheers
Mr Bomb