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im lookin 2 get a nice amp 2 push 300rms x 2. my ? is do i need a capacitor or will i been ohk, mind u im not killin the system on full blast, considerin my interior speaker r running off my deck. pm 2 let me kno.thnx

 
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Capacitors deal with the spikes in your voltage and can rebound quickly preventing damage to your battery.

I would buy a battery first and cover all problems before buying a capacitor.