Going by Rin's graph, the FX700 peak at 80Hz, same as the IE8/80. Sub-bass is 5-7db down from there. It will be interesting to see the SUI, which I hear as better balanced between mid- and sub-bass than the FX700. I wouldn't be surprised if they turn out looking more like the 334 than the FX700 in bass.
I'm not so sure about the 334s lol. At least from what I heard the bass was rather congested on them and overbearing. I think a big part of it is due to how slow the bass decay is. So in that is lingers too long.
Edited by lee730 - 4/8/13 at 7:04am