a while ago I started with a series of DIY kits that offer very good performance and easy to build.
maybe one of the more difficult ones to build is a NAIM NAP140 / avondale NCC200 derivative.
i have build 30 variants of this amp and this one is quietest of all of them. it is also the basic unit that I based my current amps on but I use more and bigger power supplies, servos and all over a more refined product.
seeing that I hold no IP on this except for the layout artwork. I will make it publicly available for anyone to build. the sound quality of this unit is way better than a lot of the commercial products that one might have access to. So be prepared that this will annihilate your beloved Rotel
not to mention any AVR that you think might be any good.
one channel shown. Amp board. PSU with incorporated speaker protect.