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Is your sub amplifier class D or class AB? Easy to tell by looking at the back; if there is a heatsink it is likely AB, no heat sink and you got a class D. Leaving an AB amplifier on will draw some power even at idle but only a few watts. Leaving a class D amplifier on will draw next to nothing. This is only a consideration if you're concerned about electric usage though; it won't hurt the amplifier.