I have a VSX-822 and I'm trying to hook up a Harmon Kardon SB16 soundbar to it. I've connected the soundbar to the receiver via the optical cable but I get zero sound from it. The optical input says "optical assignable", but I don't know where to program it. Is the optical where the soundbar receives the audio out? I'm new to this. When I put the system to Cable I get the clear picture on my tv coming from the cable box but zero sound. The sub connects wirelessly to the soundbar so there's no wires to connect to the receiver. I'm not sure that this receiver is built for a soundbar.