Hello! This seems like the right place to ask about setting up a new speaker system. I recently found a pair of knight kn3030k 3-way speakers for a screaming deal. After that, I needed to fill out the rest. I got a polkaudio psw108 subwoofer, and a Sony str-dh190 receiver. Plus some speaker wire. Sooo setting it all up. I see where the +/- wires would connect at the back of the speakers and into the receiver L/R locations, in the A row. So where does the subwoofer get connected into the receiver? Thanks for the help!