How ANYONE could think the Mobius is light in bass in any way shape or form is beyond me. I'm a reformed basshead. I dunno what planet people are on unless they're listening to sloppy bass and immediately put on the Mobius to compare. It always takes time to adjust to different headphones especially if they have different tonal balances.
The Mobius bass reaches incredibly low, and has the impact any recording desires. The only time I feel more bass is desired is in 3D mode, until I change to the music preset, then I'm 100% fine.
I've owned the TH900, as well as the even stronger D7000. I love that bass. However, that bass is different from LCD2 bass, and Mobius bass. Different, but the latter two still have a different form of potency.