I'm looking for a pair of powered speakers to be used as the "surround" channel in my home theater system. Must have red/white RCA inputs. Also, must have black mono RCA connections to go from one speaker to the other. Also, it would be nice if it had auto on/off capability, sensing when there is a line-level signal. I'm having trouble finding a pair of speakers will these capabilities. Can someone help me find what I'm looking for? Thanks!