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Message: <blockquote data-quote="n2audio" data-source="post: 5252082" data-attributes="member: 540940">That chart is only calculating voltage drop.  The over-riding factor is current.  Regardless of how short your 4 ga is it is only intended for 125A.Zapco recommends a 175A fuse at the amp, so you need at least 2 ga wire.yeah, and what happens when that fuse tries to pass too much current??  It heats up, red hot and opens, and since it is encapsulated in air and glass/plastic no harm is done.  Too much current through 4 ga won't end quite so well.  It will heat up, melt off the insulation, and burn whatever's in the vicinity.Unless you're never going to listen at more than 1/2 volume I think it's a bad idea.</blockquote>

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