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which signal ? a signal to turn on your amp, or a signal to play music.
its pretty invovling amp'ing up speakers, its not like a sub where all is needed is a power wire and a ground.
if you still wanna have L/R F/R control over the speakers. you need to tap into each speakerline and run wiring from speakerline to the amp's speaker line input, then route wiring to each speaker.
either way it requires opening up the dash to tap into the harness, or opening up some doors and reardecks to tap into and run a return wire to the speakers. plus tucking the wires underneath your carpeting. its alotta work
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