If you do go the new amp route, the SDA speakers need a common ground amp. I'd do some reading on this if you're not familiar with the topic, I'm not actually sure what the design is.
Replacing mid-80s Denon amp and preamp with new Parasound equipment
I have a Denon PR-1000 preamp and POA-1500 power amp which I bought new a few decades ago. I am considering going with a Parasound P5 preamp and 2125 v.2 or 2250 v.2 power amp. I need two sets of speaker outputs (A/B) so I can't go with the Halo series amps. I am running a mid-80s set of Polk Audio SDA-SRS tower speakers. The Denon gear has served me well over the years but I am thinking I should notice some improvement with the Parasound. Would you agree?