I have been listening to hi Rez streams (24/192) of Art Pepper and Chet Baker....tonight and I must say this is DAC is quite enjoyable. The mids and highs are really smooth. The mids have a hint of warmth without sounding muddy. I have not tried an R2R dac, however, I am guessing the E70V has a hint of r2r in the mids. The dac is really revealing.
I'm going to try an R2R as a second DAC and I'm looking orward to comparing.