I've got both some Parasound gear, and the Denon 4520 in separate systems. The Denon actually surprised me for music reproduction, and I think it would be fine as a pre. I think it is the excellent room correction that really allows music to pop. That said, my speakers are an easy load unlike yours, and an amp would be a good move.
The Parasound house sound is quite good, if a little on the warm side. I'm sure the A23 will sound similar to the A21 with less power of course. If I was going to look outside of Parasound, I'd check out NAD(demo models at spearitsound.com or the Odyssey stuff.
The Parasound house sound is quite good, if a little on the warm side. I'm sure the A23 will sound similar to the A21 with less power of course. If I was going to look outside of Parasound, I'd check out NAD(demo models at spearitsound.com or the Odyssey stuff.