You might replace the Denon receiver in your rack with a two channel preamp connected to your amp. You'd connect stereo from your Oppo 105 to the preamp, surround directly to the amps, SW directly to the sub. Using an SPL meter and the internal noise generator of the 105 (or a test disc) mark the volume control of the preamp where the levels of stereo, surround, and sub match (after trimming the outputs of the 105 channels to be equal). When the Oppo is the source, it controls he volume, otherwise the preamp controls the volume. The amp can sit between the main speakers for short leads.
That's the setup I use with my Oppo 105, Parasound JC-2 analog preamp, and Proceed HPA amps. A Sony XA5400ES and JC-3 phono stage share the preamp with the Oppo. The Oppo does most of the functions of a processor as well as surround sound and video. The result is very high quality sound from each source with high quality video from the Blu-ray and DirecTV HD-DVR. I use Velodyne SMS-1s for acoustic room correction for the HGS-15 subs.
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That's the setup I use with my Oppo 105, Parasound JC-2 analog preamp, and Proceed HPA amps. A Sony XA5400ES and JC-3 phono stage share the preamp with the Oppo. The Oppo does most of the functions of a processor as well as surround sound and video. The result is very high quality sound from each source with high quality video from the Blu-ray and DirecTV HD-DVR. I use Velodyne SMS-1s for acoustic room correction for the HGS-15 subs.
db