I had a highly expensive Telex 850ANR for use on a 737NG. Under no circumstances would I recommend this make headset, although it does work. the reason being that the headphone/headband attachment, which is pivoted, is INCREDIBLY flimsy and fragile. Just pushing the headset in its Telex case into a full briefcase did for it when I just pushed it down- it broke under almost no pressure. Having shattered the pivot, I'm told it cannot be repaired, and you should see Telex's European Customer Support (not!). £375 worth! Try the Sennheiser ANR instead.
It uses the 2 Boeing jackplug system which powers the headset. Works fine. I find myself using aircraft headsets now on full volume- the ANR used to be about half way! They are GOOD! And that is one ear.
Having given my opinion on the Telex 850ANR, I have come by another cheaply (eBay!), but it has a single Airbus plug. The Headset repair shop say they can swap out the plug for twin Boeing ones. I figure I might be able to do it cheaper myself being an elementary solderer and computer putter-togetherer. Can anyone tell me if it is easy to get inline connectors for this that are strong enough to absorb me pulling and turning to get a cup of tea? I had thought of using the older headset lead going into the new headset lead- that way it would be straight colour connections.