So I have this Yamaha WXA-50 (55 WPC). Right now I have a vintage set of Infinity Crescendo CS-3007 floorstanders connected to it. I'm not loving the presentation. It's simultaneously very fussy, boxy and mushy sounding. The soundstage just doesn't seem to be imaging properly. And yes, I've been moving them around for several months now. I live in an apartment. I suspect that my listening level is just too low to fluff out this speaker properly. I'm considering pairing the amp with a newer Klipsch set. My budget is $1K/pr max. Suggestions?