I have a question... Will this do anything?>> Connecting the yellow (sub) rca cable to both the channel 3 and 4 inputs with a splitter. Will this improve or do anything at all... i have bridged the channel 3 and 4 to the sub but i don't have anything plugged into the ch 4 input.

On another note:
When i tried plugging in one of the rears t channel 3 and 4 they made a low sound like a sub should make because i plugged in the right/left input rca's into the 3 and 4 channels. So now i just have my left/right rca's plugged into 1 an 2 inputs and have each rear on one channel.

On another another note:
would it be plausible if i can put bridge one rear speaker with channels 1 and 2? if i have to do this i will have to have one rca left or right input plugged into 1 and 2 input channels.... would this make any difference then having one channel for one rear???