The factory amp is horrible. I would not use it unless you had to. The easiest way is to get a 6 channel amp to run all of your speakers. Or get a better 2 channel amp to run 2 speakers and run the rest from your Alpine. The connector in the pics under the dash is for a factory phone option. It has switched and unswitched power. It is great for running extra power sources for ipods and radar detectors.
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