I'm using a Sonos connect feeding lossless files to old Paradigm Atoms that are very nice musical speakers.

Great clarity and enough punch for my 100db efficient speakers

I'm actually driving slightly less efficient speakers at 90db output and its crystal clear

Limited power means use efficient speakers if you want to play loud.

I do think a more efficient speaker would do this amplifier more justice

The 35 w/ch will drive 4 to 8 ohm speakers well with 88db sensitivity rating or more