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I have a pair of the headphones. They seem to work great with a few exceptions. I have experienced a cyclic hum when the volume is low. This was in an airplane and I was wondering if it had anything to do with the APU of the plane. I have not been able to reproduce the same effect with any of my DC electronics. I will get a chance to test then again in a plane tomorrow on my way to CES!
The cool thing about this headphone is that it works as a regular headphone (w/o noise cencelling) if your batteries run out.