The sound is clean, but not sterile; smooth; dimensional; lots of ’inner detail’. The only amp I did a fair comparison with (all the same components except the Pass requires RCA cables from pre to amp) was a Pass XA 25. The Pass was a little more laid back, was clearly less smooth, was less detailed, and was less musical. I haven’t had a tube amp since the late ’60s, so I can’t comment on that comparison. My preamp is tube.
I hope that helps. I’m sure you realize my comments are are about performance in the context of my system, my room, and my particular hearing and tastes. I do think the AGD products are superb.