OK, before you run out and buy a soundblaster try downloading this codec: AC# Filter

If you are outputting through spdif to your Onkyo receiver this should work with this codec. Just be sure to go into setup and select the correct options.

2xM80 VP180 2xQS8 2xM3 HSU STF3 LG 60PS11 Denon 3808 ATI 1506 LCR 2xATI 1502 Oppo BDP-83