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Ok, so I found what I considered to be a good deal and jumped on it. I currently have speakers and a 75W/channel Pioneer GM-D9500. I just bought a JL Audio 500/1 Slash amp and 2 12w3 4 ohm subs in a box that has 2 individual chambers (no wiring shared by the subs until the internal parallel connection in the amp).

I'm trying to figure out what gauge power wire I need to power both of these amps via a distribution block. Total RMS wattage would be 75Wx4 + 500W = 800W. Different places have said I need either 4 gauge, 2 gauge or 0/1 gauge. It'll be in an '05 impala, so I figure around 16-18 ft of the cable length.

So what gauge do I need?
 
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