Of course this lack of bass with the HD800s has been mentioned before.
I haven't a vast range of experience of different gear but I currently use HD800s. Initially I used a TEAC UD-h01 DAC with its headphone amp and stock cable with jack plug. I liked the sound and the bass was there but it was not enough to provide the bottom to most music that makes it more enjoyable.
I then got Toxic Silver Poison balanced cable and used it with a Headroom Blockhead amp (nine years old) plus the TEAC used just as a DAC. The Blockhead was noted for it's strong bass and indeed that is what I get. The high frequencies are also good but the mid range is a bit recessed at the moment, but then the Silver Poison only has a few hours on it and even then the mid range seems to be improving - or I'm getting used to it.
The point I'm making is that, from my limited experience, the bass on the HD800s can perhaps be improved by using another amp.
+1 on that.
I find the HD800's bass to be excellent. It might not have the bass weight like some other phones but it majors on bass control and speed while also having very good depth, Prat and impact.
It can easily become 'bass light' on any system that does not do bass properly but when the system does the bass is excellent.