I would definately recommend a cap. It will keep your bass hitting tight and strong by storing current/power for the amp? You will definately notice how it keeps your bass and speakers sounding more consistent and cleaner. Current supply is often something overlooked in most stereos, but is very important. .1 farads feeds roughly 100 watts. So for 1000 watts, you want to buy a 1 farad cap, but it never hurts to get more farads than you need. Caps have become extremely cheap. For example onlinecarstereo.com has a RF cap for $69. Good luck.
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