I’d normally agree with the AVR comments, but I worked for Magnolia for a bit and spent a lot of time with your AVR driving the B&W 804D3, which is not the easiest load for an amp. The 804s sounded sublime with the 3060 — which, frankly, surprised the hell out of me — even when cranked to very loud levels. Many people left that room shaking their heads in disbelief of what they heard (along with the price of the speakers). Your speakers are a relatively easy load that I highly doubt the 3060 would have any problem driving cleanly to near deafening levels. However, it is possible the Yamaha’s inherent character just doesn’t work for you in combination with the Klipsch. BTW, it would be interesting to know what speakers you were using with the old Yammy if they were not what you’re using now.
Moving on, If you don’t have anything draped over the TV that could be a big part of the problem as it will emphasize first reflections from the left speaker and possibly reflections from the right speaker as well. That might also explain why the sound degrades as the volume increases. If the TV is exposed, try throwing a blanket or comforter over it and see if that helps. Anyway, hope this helps and best of luck.
Moving on, If you don’t have anything draped over the TV that could be a big part of the problem as it will emphasize first reflections from the left speaker and possibly reflections from the right speaker as well. That might also explain why the sound degrades as the volume increases. If the TV is exposed, try throwing a blanket or comforter over it and see if that helps. Anyway, hope this helps and best of luck.