I recently bought an Onkyo HT-R550 receiver. I have four Onkyo surround speakers (2 SKF-330F and 2 SKM-330S) and a sub (Onkyo SKW-330). I also have a temporary center channel. The surround speakers power handling are a bit less than the receiver can provide, but I doubt that is too much of a problem. My main problem is that the sub I have is unpowered. The Onkyo HT-R550 only has a sub pre-out unfortunately. This is a 7.1 receiver however. What if I wanted to run the sub off one of the extra surround channels? Would something like this work? Link removed by moderator; sorry, eBay links are not allowed here.