Which amp for B&W 805 D3 and HTM2 D3 speakers - Rotel RMB-1555?

By the way, I am driving my 805 D3 bookshelves with 1000 watt monoblocks.  You don't really buy high power amps because you are gong to use all that power.  You buy hi power amps to get the largest power supply.  This ensures smoothest and strongest sound even at low to mid listening levels.

So, that being said, the 1585 would give you a little bit beefier bass/midbass response when compared to the smaller 1555.  It could also have a smoother response in the mids as well and could give you extended depth of soundstage, but you are spending considerably more.  It all depends on your budget point.  Both are Class AB amps and have a very nice sound.  The Rotel Class AB is voiced just very tiny bit on the warm side, but still has excellent response.

If you wanted a more neutral high resolution amp, maybe look at ATI AT4005 (retail $4495).  It is considerably more expensive, though.

Rotel will still be extremely good and very pleasant to listen to.

The smaller 1555 could start to run out of gas on movies when you start turning up the volume pretty high.

If I were doing it, I’d look at: Classe (used), Bryston (21B) or Maybe even 2 Pass Labs XA30s (Bi amp the center channel).

First, DON’T buy an Onkyo. Their reliability is atrocious, and worse, they’re now owned by a hedge fund or private equity firm that will only make it worse going forward. Next, and this will be a bit of a surprise because it sure was to me, I worked for Magnolia and demoed 804 D3s with a Yamaha RX-A2080 AVR and I gotta tellya, the sound was STELLAR. I’ve got a $30k stereo at home, and this pairing gave up very little to my home system when listening to my best reference music. I’m not a B&W fan nor an AVR fan, but I can tell you I could’ve easily lived with that pairing. My recommendation — buy a used 2080 or 3080 or, even better, one of their newer versions and see if you even need a separate amp. You might be very happy and will save you $$$. Plus, Yamaha’s reliability is top notch, and there was a synergy between the 2080 and the 804 D3s that was pretty special and utterly unexpected.  FWIW, and best of luck.

+1 for what @soix says in the Mid-Fi/ HT realm Yamaha is great gear.

They make a decent Bass to and their dirt bikes are a hoot.