yea deff dont do that it wont work you would ruin the internal amp if its a new cd player if its really really old like one of the first ones to come out you maybe able to do it but it actually sends the freq. at different volumes if its a decent head unit. you may want to connect the wires for the front back there and cut the others off. and you wont have any problems running new wires as long as you do it right.