no caps are not usless, i have 2 10in pioneers and a mono 750watt amp. they are matched and sound beautifully, but the lights used to dim when the system was cranked. so i put a 110amp alt on it and it made a difference, but it still dimmed when at traffic lights. so i put a .5 farad cap on it and it works like a dream... caution tho, the first time i used the cap i blew my electronic ignition, it was working and it blew 2 fuses then i was driving and it did it one day and my lights went out and it stalled. electronic ignition was blown, had to tow her home. i found out the + & - cables had play in them and were hitting against eachother. and FYI it does hurt like a biznitch when you get shocked by even a .5 farad cap. but its all fixed now and i found out the were loose because they were stripped and i had to drill and tap 1/4 20 bolts in there. but all is well and i do recommend having a cap on her.
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