My cap is 10 farad and Ive seen them up to 30 for audio use. A cap just helps to firm up a weak power supply for short bursts. A cap will only help for audio systems that have a beat, drum or burping. If you want to win a bass contest you need a strong enough power supply for a sustained beat to get the better SPL ratings.
So, even if you got caps, they need to get the power from somewhere.
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