As far as I know, all of Sony's decoders contain their "Digital Cinema Sound" that has different modes to create the presense of more speakers. So you if have 2 surrounds to you side, it will simulate having rear speakers and vice-versa. Has anyone tried this and does it work? I have a Sony DVP S550D hooked up to my Onkyo 595 via coax. I assume my Onkyo does the decoding since I'm not using 5.1 outs on the Sony to the 5.1 in's on the Onkyo? So any changes I make in Sony's surround modes won't make a difference? Thanks Mike D.