After several weeks using nothing but USB32 I have gone back to the Audiophilleo 1 on Master 7 input #1. It seems there is just more meat on the ribs with the AP 1/ Input #1 combo. Fuller bass, clearer vocals (less edge), silky highs. Very subtle but noticeable changes that enhance presence. As much as I like USB32 the AP 1 seems like a better match for my ears - at least until I try something else. Anyone else have a similar experience?
What firmware were you using?
If you have #4, you might well try the spare firmware (#3 or #5, depending on the date of purchase) to add warmth and weight to the sound.
I've been going back and forth all week and to be honest the USB32 interface is excellent. I've come to the conclusion there is no perceived difference in sound (AP1 vs USB32). And if there is hard to detect and beyond resolution of my equipment and ears. The Master 7 has USB firmware #4.
Edited by DACLadder - 4/21/13 at 8:00am