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Does your sub amp have something along the lines of "line-level sensing"? Some subs are able to turn on when they detect signal via the line level converter, others require a wire to be supplied 12v when the stereo is turned on. (Typically that wire's blue, if my memory serves). I think my current component sub actually has a switch to tell it to turn on line level sensing or not.
I'd suggest reading your amp's installation manual to be sure.
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