Just get a 2 channel power amp and use your Denon as a pre for 2 channel. You will be surprised how the dedicated amp helps your 2 channel come alive. You can also get a phono sound stage that can improve your vinyl and connect a dedicated DAC streamer for digital. I bought a Emotiva BAS-A2 (160 Watts per channel) for my Yamaha A-840 and it sounds great with my Tekton Lore Be's for 2 channel. It also lets you use the Audyssey setup and remote features from your Denon.
