Audio Capacitor
A look at what is currently available on eBay
 Massive Audio MA Capacitor 1.2 Farad US $20.00 
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 20uF DC 400V Axial Lead Electrolytic Tubular Audio Capacitor US $11.07
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 1200V DC 0.1uF 10% Metallized Polypropylene Film Audio Capacitor US $3.80
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 BULLZ AUDIO BCAP 2.2 Farad Car Digital Power Capacitor US $24.95
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 20 Pcs Capacitor of Various uF For Audio and Guitar US $.99
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 Vintage Audio Research Capacitors US $10.00
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what is the guideline when looking for a audio capacitor for a car system?
The lower the ESR (.0016 or less) the better. Go with 16 volt, not 24 volt.
It's 0.5 Farad for every 500 watts of power.
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While the article that Javin M provides held true at one time, there are a few things that time has altered. This article was written some time ago and changes have occurred in the manufacturing of capacitors. In the article an ESR of .017 was given, the problem is that caps made today have an ESR of 0.0016 or less which is a far cry from the days of old.
What does this mean? It means the calculations and information now change quite substantially and can no longer be held as true.
That series from Richard Clark was written specifically about a type of very large farad capacitor with ESR ratings that made them useless, and it was never meant to apply to all capacitors. You're using it out of context if you're trying to make it support your "why caps don't work" argument. The fact is that Richard Clark was one of the very first people to start using capacitors in competition car audio systems, so I doubt that he'd agree with your arguments here.
Purchase the book of Richard Clark and David Navone's A2TB Tech Briefs if you want to know what they really think of capacitors: http://www.autosound2000.com . If you're interested in learning more about car audio, this book should be in your library.
A cap is only good so far as the audio system isn't trying to pull too much from the electrical system.
I know a cap can be beneficial as I'm running one and I measured a definite change in my electrical systems response curve to big bass hits with an oscilloscope, however, this won't be the case for ALL vehicles.
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June 21st, 2007 in
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