I got a pair of these to check levels and stuff for live mixing http://www.ultrasone.com/index.php/en/products/pro-900.html They are BY FAR the best headphone I ever heard. I switched to Sennhiser HD 25 's for live after using Sony 7506's for ever,like 20 years or so. Anyway these were given to me by a friend who had several pairs,I think they go for around $400 or so and I would gladly pay that for these as they are unreal.The drivers sit in front and back of the ear instead of right at your ear canal like most headphones,thus you can listen for hours with NO fatigue at all. I have done so myself. I could never listen to the sony's or the senn's like this ever!!! If you are in the market for an amazing under $500 pair of headphones I would HIGHLY suggest checking these out if you can........ Cheers