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Use the Low Level(pre amp) lines. The High Level go thru the head units amp so the quality decreases.
If the battery is in the front and the amp in the rear I would run 4ga to the back to a block and then a 8ga supply to the amp and a 8ga ground.
I would use 16ga if not 14ga for the speaker wire. 18ga is kinda bare minimum. A long run from back to front is going to need a bigger gauge.
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Comments should be taken as Opinions not as Statements of Fact 
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