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i just bought 2 kicker VR 12's that are gonna be running at 4ohm, and a kicker sx450.2 amp is going to be powering them. And i have a optima yellow top under the hood. I have had 2 older VR 12's before in my old car running off a 760 sony amp and they worked fine with out one. so do you think a cap would be a worth while investment?

 
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You shouldn't need one. Try it out first before you decide to buy one.

 
Rep Power: 381

kool iwas just wondering before i mold all the stiff in and it turns out i need a cap.

 
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you never *need* a cap, it is just a good rule of some for a stock electrical system (or even stock alt with big battery). it will help stop your lights from dimming if they do, as the cap will provide a burst of current when your amp demands it. rule of thumb is .5 farad for every 500 watts of power, so consider that and decide for yourself.

 
Rep Power: 335

would that be every 500 rms wattage or 500 peak watts for each .5 fared?

 
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Rms^^

 
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yeah, peak wattage is for suckas

 
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Do you need one? Install it, see if your lights dim when the subs draw current. If they dim, and it bothers you, a cap will be a worth while investment. Will it hurt your electrical not to have one? Not in any way, shape or form. The only thing a cap does is help combat dimming. If dimming doesn't bother you, don't spend the money on one.