A 2 channel preamp will do a lot more for music than an amp will. Amps don’t sound that different (they do sound different) but that avr is sucking the life out of your music. You can use an integrated amp with a Home Theater pass through. The higher end macs have this function but I am not sure about the lower end models. I use a preamp/amp combo for music and pass from a receiver for movies.
I own both Klispch and Mac (among other brands). They are fine together but don’t expect anything too amazing. I have played the RP8000f (I owned it for a bit) off a $800 Marantz and a $30,000 Mac based front end (both my systems) in the same room and the difference was not near as big as the internet would tell you. But all AVRs short of very specialty items really kill the soundstage and transparency of the music. But your speaker will still sound like your speaker regardless of front end and better will just be more transparent. It just comes down to what is the biggest limiting factor. 99% it is the speakers but in the case of an AVR…. Probably the AVR.