After EQ settings, the bass is strong enough. I don't think it would get as bassy as one of the most best IEM's for bass (IER-Z1R), but it's enough I think. I've listened to it for a few days now and my ears are adjusting. I do miss my old amp driving the HD800 (Mainline), but I'm also pleasantly surprised how well the Mojo 2 drives this.
I gotta say, I'm really miss having a full-sized headphone again. I can't really tolerate anything that's heavier than these HD800S's (330g without cables) so I've been using IEM's most of the time for desktop use. I'm really enjoying this HD800 right now, and I've never had such a drastic "burn in" process as this when my ears adjusted from an IEM which I've used for years to the HD800S. I sold all my old amps and primarily use just the Mojo 2 now, but I miss the sound of my old Mainline. It drove the HD800 so well and paired perfectly with the Mojo as a DAC.
Which brings to my next question, if I want some of that tube sound (not too tubey and viscous, but more along the lines of Mainline), but don't want a large footprint on my desktop (I have more of a modern setup now with a glass table). What would be a good sounding, non-intrusive, semi-tube amp with fairly good aesthetics to pair with the HD800S using the Mojo 2 as a DAC?