i have 4 12" pioneer ts-w306c 400rms apiece 4ohm subs, my buddy has 2 15"memphis mojo that are 1000rms apiece. he just doesnt have the power to push them. my question is if we traded subs would i have a louder system with the mojos? providing i put the recommended power to them.or would the 4 12s be louder? thank you for your opinion.