As usual, MANUAL IS GODSPEL, I dove straight into the picture of the back with all the connectors REVEALS a treasure trove.
1. You should be able to play BluRay discs, as is, no problem, all speakers blaring. If it doesn't return this faulty unit.
2. Playing from the HDMI-connected TV and if BOTH have ARC ENABLED, and broadcast station is sending you DOLBY DIGITAL, again, all speakers, no sweat.
3. Playing ANYTHING else, like a PC, MUST USE OPTICAL INPUT. As long as source is surround, again no problem.
4. If whatever you are playing is STEREO (2 channels), there is a button on your remote labeled DSP/EQ, one of its mode, M-Stereo, will take 2 channels and play on all speakers.
You are welcome.