Trying to pair the Sennheiser RS 175 with a Yamaha RX-A1030. I want to connect to the RS 175's digital optical input. Tried connecting from the A1030's digital optical output...no sound. Connected from the A1030's hdmi secondary output, ran that to an hdmi to spdif converter, then to the RS 175's digital optical input...still no sound. The RS 175's manual states that it can only handle PCM audio. I think that either of the connections that I made should have worked, so I think my problem may be that I can't seem to figure out how to output the audio of the A1030 in PCM format. Any advice?