Thinking about getting a DAC. My question is when hooking up a Blu-ray player, i need to hook it into the DAC( via optical or Coax) then the Blu-ray back to my AVR(via HDMI)? If this is correct, how does the AVR know to bypass the audio from the HDMI? Is the something i need to set on my AVR(Marantz SR7005) Thanks.