Alright, I just bought the RM6900's, which I'm trying to hook up to my old receiver. Its a Technics SA-DX940, and it has all of the inputs needed to setup a 5.1 surround system. Looking at the Polk manual, I decided to try the Polk suggested subwoofer setup. I wired from my receiver to the speaker inputs on the sub, then from the sub to the two front speakers. Before I hooked up the rear sats, I wanted to see if my progress was working out so far. Maybe this is the problem, I wasn't sure if you needed everything hooked up before the surround would work. I highly doubt thats the case, but if it is then this is a simple solution. When I set my receiver to surround sound mode, I get absolutely no output. When I switch it to analog stereo, I do get sound from the front speakers, but obviously no sub or center channel. I'm hoping its just caused by not having the rear sats hooked up. Please help!