You don't need a Blue Sound Node at all unless you want to add in the additional streaming soruces that the Node offers.
Your setup would be Innuous Zenith usb output into the Luxman D06 Dac coax digital output from the Luxman Dac into the Codex and then from the Codex analog output into the Quad Headphone amplifiers analog inputs and you are done
Dave and Troy
Audio Doctor NJ
Your setup would be Innuous Zenith usb output into the Luxman D06 Dac coax digital output from the Luxman Dac into the Codex and then from the Codex analog output into the Quad Headphone amplifiers analog inputs and you are done
Dave and Troy
Audio Doctor NJ