By using the analog outs of the Oppo/NuForce I have a purer source going right to the Audio Research Preamp for music. The ARC LS3 has two mains out, so that one can go to the mains and the other to the M&K sub. The 7.1 outputs from the Oppo and cable signal from the Tivo HD go to the NAD M15. Using the Tape Mon on the ARC, I can then feed the 7.1 main signal from the NAD when watching movies, thus having a dual system that is separate, yet together.