Thats my third Senn's, 6th cans overall. The HD598 needed minimum 24 of hours of burning-out before even I could listen to some music. Out of the box bass was simply unacceptable, than after another 36 hrs. of "reggae into the pillow", it got a lot better, but still kinda restrained, not fully 3-dementional. Hope it gets better with time, or perhaps lite modification will do the trick :P Beautifully balanced highs and mids. For the money *** they are full 4.8! overall 4.5 for me. ( tried 2 other *** pairs, those are much better than anything else)