Initial impressions…I have to say my 660s pairs extremely well with my Geshelli 2.5 pro. Very very clean and impactful. Much better than my thx789 and very close with my thx 887. Definitely cleaner than both with the 887 having a bit more richness.
Besides being a bit bass shy the 660 can sound a bit too crisp with some edginess on certain recordings but the geshelli cleanliness seems to greatly mitigate the problem. Very impressed with this amp. Btw no pot problems with this amp. Has been a nightmare with the thx’s.