In article ,
"Johan Wagener" wrote:

I heard that the car battery cannot supply current at a fast enough rate
(because of chemical reaction neccesary) for subwoofers and that a cap is
needed.

At what power ratings should one start to worry about this?


When the current is high enough to worry, you're in need of more storage
than the usual 1 to 3 F cap. Car audio stiffening caps are mostly a
gimmick.