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the ls4 and sc door speakers and the 2 side rear deck speakers are compatible all 4 ohms 40 watts max. the subwoofer is not conmpatible in any respect to size, watts and ohms. the sc pioneer sub is 1 ohm on and 5 ohms on sc nakamichi. the ls4 sub is 2 ohm pioneer and 4 ohm nakamichi.