All 1/2 farad caps for car audio will be low esr electrolytic... theres no point in having a low esr cap if it can't even hold more (discharge) than a standard car battery... ie: typical car battery maximum discharge rate = 100-200 amps... 2 farad cap = 100 - 200 amps... but note the battery voltage under such loads will drop dramatically (from 14.4v to 11v) where as the caps voltage will stay the same!
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