Moffat BassTM isn't really a matter of volume of heft, although that does have something to do with it. It's matter of how the bass sort of punches and propagates toward you (especially with speakers) and how it stops on a dime, and how textures and pitch differentiation can be heard. It appears the staging aspects have quite a bit to do with this. Moffat Bass is in opposition to PCM1704 or to a lesser extent UltraAnalog bass, which tends to be syrupy and ill-defined; or Sabre bass which is thin, limp-[redacted], and lacking pitch differentiation.
My OR5 was not fully upgraded, but I used it with the Wyrd (I did not like the full turboclock effect and the Wyrd provided a partial turboclock effect for dirt cheap), and a external Sigma11 power supply. USB sounded blacker and less grey than from either the SPDIF or AES from the OR5. YMMV. USB tends to vary quite a bit from PC to PC.
The best sounding transport by far I have was the Theta Data III, a 50+ lbs monstrosity based on a LaserDisc player. I used AES via a short 6" cable. The Data III easily has the best blackground, imaging accuracy, focus, resolution, and overall refinement. I have reverted back to spinners instead of computer audio because of this. Also, spinners are easier for my wife to handle. The user interface for CDs is superior, and you use up more calories trying to find that fricking CD you want.
It's my understanding there are no caps in the signal path.