File A is louder, somewhat more compressed, mono, flat, lifeless, with a high freq boost, it also sounds like crap
File B sounds great
So Im guessing file A is the audio after the four passes and B is the original material.
There´s a thread somewhere, probably in the shoutouts section, of 10+ passes of material... none of them sounded as bad as these four passes here, so maybe cables or board or something else is messing up the sound. Or maybe you´re driving the audio through the MR816 pres?
Whatever it is, the result is beyond bad conversion, more like a speaker effect.