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Message: <blockquote data-quote="skimo" data-source="post: 356727" data-attributes="member: 551553">Definitely run the 10 guage wire direct to the battery if you are going to use the internal amp.  If not, just use the factory wiring harness.I had my 9813 (same internal amp) installed by my Alpine dealer.  They hooked it up to the "direct battery" wire on the factory harness.  It made my SPX components sound like crap.  Once I realized what they'd done I asked them to run a wire direct to the battery per instructions.  I finally called Alpine and talked to one of their engineers who validated the need for the 10 guage wire.My installer was blown away by the difference it made.  100% improvement.</blockquote>

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