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Ken,
I will give that a try. I have tried quite a few NC headphones before the 8000's with no problem.I really enjoyed the Polk the best. Amazing sound quality.
If it is something external that is...

Ken,
That was the first thing I did.Customer service and tech support were no help at all. They had no idea what it might be. Thanks for your repy though. Can't return it I guess I'm stuck with it.I...

I recently got a very good deal on the ultrafocus 8000 headphones. That is, good deal if everything works properly. Inthis case it isn't and I can't return them.
Although they are used the...