Well, I just got CleanBoxPro adapters, and tried them with a Marantz receiver. This Yamaha sounds more natural and better than the Marantz, surprisingly. Before I had the adapters it sounded nice, but with the adapters now it sounds really good. I like the sound better without using the YPAO setup actually, though with it equalized it seems to deepen the bass and reduce the overall volume of the bass. On the Marantz the bass is overpowering, I couldn't find a way to make it less. I think I'm sold on Yamaha.