An Optima will help a little bit, but not much. the main reason for the Optima is to be able to discharge your battery fully and re-charge without frying it. The reason your lights dim is because the draw from your amp is more than your alternator can produce. When you're driving your alternator puts out more amps than when idle, a lot more. So whenever you're stopped at a light and bumpin, your lights will dim and flicker and anything else that is electrical too. The Optima will help a little bit because it is designed for high draw systems. Your best bet is a second battery in the trunk or a HO alternator. The alternator will cost some bills and your 600W amp shouldn't be enough to justify getting one. Your best bet is to updgrade your stock battery with an Optima and see if that helps. If not, then I would go with a second one in the trunk which I know will fix the dimming problem.
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