The zero guage wire here is $5 a foot and available in a brand called Suntec (not sure of the spelling). The only had 2 feet of the Rockford left so that was no good. They also have some JL Audio 2 guage at $7 a foot. They recommended the Suntec stuff.

How thick should the other wire be? The one that connects to the D+ ?

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz