Use stereo amp and speakers with surround receiver


I have a stereo system that I'm happy with but would like to add a surround setup which utilizes the existing amp and stereo speakers as the left and right fronts. My amp is a Rogue Audio Sphinx, speakers are ML Odysseys and I'll be using a Harman Kardon 50wpc 5.1 receiver.

The receiver has coax and optical digital out connections but the amp has no digital input although it has 3 selectable RCA input pairs. I have all other speakers in place and ready to go but am having some difficulty figuring how best to include my fronts maintaining power from the stereo amp.

Because the center and rears will be powered by the receiver, I need to find the best way to include the stereo amp and existing speakers for the left and right Martin Logan speakers. I have an extra DAC and am considering using the digital out from the receiver to the DAC and from there to an RCA input on the Sphinx.

I assume that this connection will work but am concerned about coordinating volume control from two amplification sources. Any advice would be much appreciated.
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