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Second battery, capacitor or neither?


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So i have a 3000w rms system running off a 180a alternator. I have just done the big 3 with 0 gauge but i am still getting some voltage drop with heavy bass hits. I cannot get a bigger alternator than the one currently fitted to my car (BMW F30). I only ever listen to my system with the engine running so i’m not sure if a second battery or capacitor would help or cause more drain?

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Alternator.  

http://www.stevemeadedesigns.com/board/garage/vehicle/2438-jeep-commander/


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If 12.7 is the worse, and its only here and there,.. i wouldnt do anything. If you hold 13,... meh... roll with it. Save your money. 12.7 is battery rest, its just fine. Especially if this is at idle banging.

Is the worse drop with some rev, or at idle ?

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