If the "noise" is actually slight ripples in voltage, it will smooth them to a certain degree, but this is not "Audible noise".
I have not seen a single article that states that a stiffening cap will help reduce noise. Not even from a manufacturer trying to sell them.
I would think that if it were in fact a benefit of using a capacitor, every manufacturer would shout it from the rooftops to try to sell one more unit.
In my opinion, Stiffening caps are snake oil, and if your sound system is ridiculous enough that you need additional help, a second battery, or upgraded alternator may be in order.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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