Right now I have the oppo set up for 4 large speakers so the lfe and center are combined, then sent through the OPPOs rca outs to vintage gear. The only discs I have found that must have a center channel are those pesky doors discs. I do intend to experiment with this and see if there is a difference. I am now looking for a sound card with 4 rca inputs so I can digitize my quad reel tapes to 96/24. I checked older posts and they all have sound cards with the larger pci connector and not the smaller pcie. Mt pc is a dell xps 870 with windows pro 7. Any ideas for a sound card that could do this?..