I'm pretty sure that the 598 can drive digital speakers as you want to. There are digital outs for L/R, Surround and C/Sub so it looks feasible. For interest, I currently have 5 channels of DSP5000s with a 598 and 568.2MM but have decided to sell the DSP5000s and go for a 2 channel system. I'm going to keep the 568.2, though, partly because I prefer the sound of the 598 through it and can use it as a pre-amp and partly to preserve future multi channel options.

Regards,
Steve

Steve