Can anyone who owns a pair of DT 880 Pro's (250 ohm preferably) tell me how the sub bass quality is? Sub-bass quality of course being relative (these are headphones afterall and not a near field system with a sub woofer), but I want to know if frequencies like 40hz and below come across at all on these cans. I know the DT 770's are supposed to be the much bass heavier phones, but the more neutral response of the 880's interests me for mix referencing purposes. Basically, if I have a deep 808 kick drum found in hip hop or dance music, will it come across at all or be totally lost? I'm not looking for overly-hyped sub-bass, but enough so that I can get a sense of what's going on down there when I mix. I currently use Sony 7506's and I feel like the sub-bass is non existent.