You mentioned N6ii with E01 was similar in sound to the QP1R, which I own. Do you know how A01 sounds compared to the QP1R? I am looking for a better UI dap.

@mwhals I owned the QP2R for a bit last year and ultimately sold it because I found the UI (among other things) too clunky. The sound was top tier though and it wasn't until I picked up the E01 for my n6ii that I felt I finally had something that could compete with the QP2R sound wise. The A01 has more of a mid-bass emphasis and (to my ears) isn't quite as resolving or well extended up top as the E01 is.

@mwhals yes, the N6ii was very similar to QP1R and had a bit more output power. It would be a good upgrade IMO. The battery life will be similarly poor on both though (~8 hours of playback time) so there's that.