If your interest is listening to 2 channel music, then separates will beat your Denon receiver or any AVR. The Denon is built with circuitry to do multiple tasks, that’s fine for HT but not optimal for listening to music.
Looking at the impedance curve of your Revel Concerta’s, the Parasound a23 rated at 125 wpc/8 ohms, 200 wpc/4 ohms would be able to drive these speakers, but if you read the recommendation, an amp with higher current might do better. That’s because of the 4 ohm load thruout the mid-bass and the drop to 2.9 ohms in the low treble.
The Parasound looks very respectable; it's a John Curl Class A/AB design, but why aren’t you looking for an integrated amp? Do you already have a preamp?
Looking at the impedance curve of your Revel Concerta’s, the Parasound a23 rated at 125 wpc/8 ohms, 200 wpc/4 ohms would be able to drive these speakers, but if you read the recommendation, an amp with higher current might do better. That’s because of the 4 ohm load thruout the mid-bass and the drop to 2.9 ohms in the low treble.
The Parasound looks very respectable; it's a John Curl Class A/AB design, but why aren’t you looking for an integrated amp? Do you already have a preamp?