I've wondered about this for awhile, I know that pretty much all cd decks are 50Wx4, including mine, and mine just happens to be 18WRMSx4. Ok, so my 6x9 are 45 watts rms and my 5 1/4's are 35 watts rms. My cd deck volume goes to about 40, but anything past about 35 makes the speakers start to...