Heya,
Just a note, the DT770 is not that bassy. I'm not sure where this perpetuated theme came from. It's not thin, it's not anemic. And no, it's not true-neutral, but it's not boomy and bassy either, it's warmer than neutral. I think most of this false information came from people who just look at graphs of frequency response and haven't actually listened to them, or at least, haven't heard what bassy headphones sound like. It's less bassy compared to the HFI580 and Q40. But I digress...
My DT770 is bassy however, because I enhance it's bass by +3 db across the lower spectrum with hardware EQ.
Very best,