I recieved an email from Kohn at Audiocubes today to reassure me that this is not a defect. He was very helpfull about the situation explaining that if there was a defect, the phones could be replaced.
On the subject of sound, I continue to be impressed. The bass has tightened up considerably and vocal colorations diminished.
Midrange detail is easier to hear than with the HD600 and the bass not as bloated. Highs sound clear and clean but I'm no longer qualified to measure extension due to my moderate high frequency hearing loss.
Remember, this is without an amp till the new Meta arrives ( drool ).
Overall is this headphone as accurate as the Sennheiser? No, but is it more fun? Yes IMOP. More dynamic, better rythym, more comfortable to me, and for $99 you'll be hard pressed to find better.
Anyway I decided yesterday to bite the bullet and go for the W1000's. I'm liking the AT sound so more must be better, right?
I also like the level of isolation which allows you to enjoy music at low levels without hearing too much background noise and still be able to hear phones etc.