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Aftermarket subwoofer amp signal sensing not working

caloric

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I'm installing an aftermarket sub, and the aftermarket amp has both speaker level and pre-amp level inputs. I'm tapping into the wires for the stock sub to get a speaker level signal to input into the amp, and the amp is supposed to be able to detect the signal when the stereo is on and turn on (so I don't have to run a remote wire to the fuse panel to turn on the amp).

For some reason, the amp isn't turning on like it should. Has anyone had this problem? The amp is a JL JX500/1D.
 
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