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Yes capacitor. 1.0 fared will work for about 400rms maybe more just going by my system.. I had the dimming lights problem. I thought a optima redtop would help which it did a little but I hated dimming lights driving down interstate and whatnot so I got the cap and now it doesnt do it at all..
In the car I have the system in, the electrical system is a joke (its a kia well kias a joke anyhow) so maybe a redtop would clear this up for you....
i got the same prob. running 800 watts rms and the lights blink right in time.i put in a red top batt, still does it, but not as bad. but still noticable. gonna get a couple of caps here soon. hopefully that will stop it. its very annoying.