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So with speakers I always just thought of it as the basic vi=w

So a sine wave of 12v through 4 ohms will produce three amps and thus 36watts.

But when you put a square wave and use pulse width modulation on something like an led or fan you can simulate a different voltage and then come out with a different wattage.

I know that sine waves acts something like a 70% duty cycle square wave, so would 12v into 4 ohms actually give me 17.6 watts on a speaker instead of the 36 that I previously calculated? (or anything else for that matter)?