I pulled a Kenwood sub out of our old car.... it's a flat, amped 1 active/1 passive cone deal, i forget the model no. Anyhow it fits under the passenger seat with a pair of home made brackets and fires down at the floor. I've pulled power to it but am having trouble pulling signal.
In the car I had it installed to preamp outputs on the head unit via RCA cable, but there's no such critter on this head unit (stock am/fm/cd/sat). I can tie it into the right and left speaker lines, but I can't identify which is + / -. I read how to check speaker polarity with an AA battery, but the factory speakers are enclosed in a plastic housing making it impossible to see the movement of the cone. I've tried and can't locate a wiring diagram that provides this level of detail. Anybody have a suggestion or know the polarity?
Also any tips on running the power signal wire (low current switches on power to the unit when car is on, off when off...), I don't have to have it but it would be nice.
I'm hesitant to go with a new head unit since this one is decent, I've still got time on our Sirius, and I'm worried about the whole CANbus thing and screwing something up. Hopefully with a little help I can make this work.
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