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Message: <blockquote data-quote="audioholic" data-source="post: 7440504" data-attributes="member: 549629">Copper is copper. Two runs of 4ga has more capacity than a single run of 2ga. But usually people just have two runs of wire because they started off with one, and simply added a second when they upgraded their power drain.As akheathen suggested above, the fuse on the power wire is there to protect the wire, and should be sized according to the wire capacity. The fuse should be more than your maximum current draw from your amplifier(s), but less than the capacity of the wire. The wire, obviously, should be sized so its capacity exceeds the maximum current draw of the stereo.Im no SPL competitor, but I assume they prefer running mutiple runs of 0ga because that's the largest sized wire that you can get 'car audio' connectors for. 0/2 and bigger wire usually requires industrial-grade connectors and hardware.</blockquote>

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