I have the Denon 3801 receiver and Paradigm Reference Studio 100's and it sounds great even at very high levels. I would say that the problem is with your speakers. The Denon 5800 is an awsome receiver but you would be spending the money more wisely to upgrade your speakers instead of buying the 5800 right now. I think you would end up with the same problem you have now. The 3801 is definitely good enough to drive the monitor series speakers.