@sgoods555 the RP1 is a modern tube design. There’s no tube rush/hiss. I had no issues with it playing anything from string quartets to Slayer, Metallica and everything in between. It will be a very nice jump in quality of sound from your AVR. If you pick one up used at a great deal, you can try it in your own system and if you don’t like it, flip it at no loss.
Also, when I had the RP1 my speakers were Martin Logan Montis.