Luxman, Marantz or Naim for Harbeth Compact 7

I have to agree with arafiq. I have the LUXMAN 550axii paired with 30.1 with rel s/812. The LUXMAN replaced a superuniti which was very good, but the LUXMAN took it to a different level. I never heard the supernait 3 but I suspect it has the same house sound as the superuniti. Akg_ca recommended the LFD which I know a lot of Naim owners switched to and swear by. Never heard the LFD but you might want to check them out.

I owned C-7’s for many years. While they do well with many amps they really shine with powerful solid state amps and love Class A warmth. Have you considered the Coda CSiB V1? Reach out if you want to learn more—I’d be happy to assist.

I have a Naim Super Nait 3 that sounds pretty good with Harbeth SuperHL5+. Similar listening tastes.

I’ve owned multiple Luxman amps (509X, MQ88uSE, M900u) and Naim (Atom, Nova, Supernait 3) AND Harbeth C7 (40th anniversary) and it really depends on the sound signature you prefer. The Luxman will be clean, powerful, detailed with a bit of sweetness on the top end. The Naim will be a bit less refined but more propulsive and will sound better across a wider variety of genres. 

Both amps pair excellently with the Harbeths. 

None of them. Accuphase.