I've been doing searches for the answer and can't find anything. I have a pair of Sony mdr-v6's. The output isn't really loud and has very little bottom end. I don't listen to bass head music either. I suspect there is an impedance mismatch. If you have an answer, could you provide a link to back it up? In the car, plugged into the aux in jack, I have loads of bass on a stock system.