On my receiver (RCA RT2500) each of 6 speakers can be set to large/small/none. Right now I have no center channel speaker. If I set it to None, will the center channel be redirected to the front left/right channels? My 10yr old ProLogic system has a phantom center setting to do this, but I see no corresponding setting in my RCA manual. Do modern digital decoders have a phantom centre type setting?