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Originally Posted by Powderedmaggot
Well if it truely has an 800w output, input would be slightly higher. 800W/12V=66.666A. According to the electrical code #8 is rated for 45A continuous load so while it will work it would not be ideal. #6 is rated for 65A and would work better. If you can not find #6 I'd go with the #4.
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Very technical here, have to say automotive wiring doesn't fall in the NEC rule book and no one running audio is really going to run peak amps long enough to melt the wires. At peak the speaker will be destroyed long before the wires melt down. 8 gauge is workable, 4 gauge would be better but not really needed. 6 gauge, I haven't seen any places that carry or sell 6 gauge for car audio installations.