To be fair, the uerm does have some bass roll-off. I found it had a nice amount of bass, generally, though. The sub-bass extension wasn't fantastic, so not exactly neutral in the bass. A great sound, overall, no question.In terms of sub-bass, I may have mentioned before that Dr. John Moulton of Noble Audio cited some research showing a little extra sub-bass sounds more natural to listeners, this may be exactly what Anax is referring to.
I just got my UERMs and am quite shocked about the bass, there is certainly more mid bass than I was expecting although I last demoed the universal version 1.5 years ago so maybe my memory failed me or I never sealed quite right. That being said while I find the mid bass slightly boosted with a natural and solid level of impact, things start to get a little lean at 50-60Hz and roll of beyond there. My Hidition Viento-R have less mid bass but actually grow towards 20Hz and is a Much more realistic feeling. All this being said I can't fathom how one sees these as bass light unless the bass drivers are switched off!
Wonder if the FSP shows some beyerisque qc issues (box of chocolates), since there's no way that I've heard a 5-10 db increase in bass relative to >400Hz, as innerfidelity's graph suggests.. Paradox, HD650 and even the K702 ani (now that I picked it up) show more response regardless of music material. Hmm...
I agree with this from my experience. YMMV.