Pubszon Posted October 3, 2012 Report Posted October 3, 2012 Hi. I have a Hifonics XX Colossus amp and a pair RE SX18 sub. My alternator 90A and the battery is 80Ah, but when i listening loud music the voltage is down under 12V. I need bigger alternator or one more battery or what? Sorry for my english. Thank you for helping. Bigger alt and batt! One bigger AGM battery is enough and no need secondary batt? How big it should be the alt? 150A enough or bigger? Thankl you. 150a should be fine. bigger is better though! i would get another big battery too Alright, thank you, last question. 2 battery may be difference or just same?
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