M sprank, Both "sides" have correct info. "distortion" in this case is the "200w" amp providing more than 200w. The amp rating is NOT the max distorted power output. The rating is the max undistorted power output! The distance from there to the voltage rails is unknown from a basic data sheet, and in addition one distortion starts occurring, if you look at the power curve of the waveform, you're going up in power significantly. 20v peak to peak sine wave contains less power than a 20v peak to peak square wave. Bottom line, unless the sub is rated for more than the total (nondisclosed distorted) power output of the amp, you can overheat and melt the voice coils. (This statement assumes no margin on the rating, which with reputable brands, such as Msmith's JL Audio, will have.)