ALL I CAN SAY IS WOW. I have owned a yamaha z-9, yamaha 2600, and misc top line sony and others. Nothing sounds like this. I am running Samsung 1400 blu-ray, Toshiba HD-DVD, and Direct TV HD Sat Box. I have only had it two days and it just keeps blowing me away. Music cd's HD-DVD, DVD, and BLU-RAY's, even regular tv. WOW!!!!! I am running Polk LSI25's LSIC and high dollar Boston Acst rears don't know numbers. I am going to add a couple more rears for 7.1. The amazing thing is I unhooked my NAD T973 amp. I really just don't need it. Sounds great without it. PROP's TO ONKYO INTEGRA RESEARCH ON THIS ONE!!!!!