I am currently considering these 2 amps, thinking of hooking them up to the Yamaha NSP-320 sub/sat package or perhaps a 5 speaker package with no sub (budget won't stretch). Yamaha NSP-320= £150. The thing is the Yamaha 430 does DTS-ES Matrix 6.1, which is basically a phantom rear which would be a nice little bonus. My Q is do the Sony 585/685 amps have this feature or any anything like it? If the Sony does the phantom rear speaker then i'll probably get that. The only thing putting me off the Yam is that it only has 2 digital inputs, but i guess i only need 2 (DVD player and Xbox). I would consider the Pioneer VSX-D511, which creates a phantom rear but i haven't read any reveiws for it. Advice on amp choice would be appreciated.