As a general rule, 4 Ga. is good for up to 100 amps (at 20' length)
anything above 100 amps, go to 2 Ga or 0 Ga.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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