I sometimes find the HD800 could do with a touch more bass. For this reason when recently buying a sealed can I went for the NAD viso HP50 because it has apparently got more realistic bass when using speakers in a room as a reference. I've had them a week and I find them way too bass heavy and I feel it compromises the sound stage massively . I now realise never to doubt the HD800s bass. It's perfect!!!!
have you tried TH 900, my fav bass can.