Coax sounds good but so far not so different from USB with ZX1. I did not have time to compare though.As for VE6, you know it has a switch to change sound right? With position X1 qnd X2. X2 is more flat like Stage 3, but with thicker sound. X1 has more bass and a larger stage. I think X1 is more fun. Very good SQ...but at the price I am not sure yet.