When do you need a big capacitor on your power? - diyAudio
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Old 17th October 2007, 12:31 PM   #1
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Default When do you need a big capacitor on your power?

Hi folks,

At what point do you need to stick a 1+ farad capacitor on your power coming from the battery? Is there a general guide that can be applied to ascertain whether it is required?

~groover
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Old 17th October 2007, 02:20 PM   #2
troystg is offline troystg  United States
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A stiffening cap "near" the amps is ALWAYS a good idea.

Generally 1Fd is plenty, and in the "rear" of the vehicle or as close to the amps as possible.

Makes no sense th have the cap under a seat and then a long run of cable to the trunk.
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Old 17th October 2007, 10:23 PM   #3
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haha sorry, my question isn't the physical location of the capacitor, moreover when do I actually need one? when a certain amperage is reached?
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Old 17th October 2007, 10:34 PM   #4
troystg is offline troystg  United States
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Quote:
Originally posted by groover1234
haha sorry, my question isn't the physical location of the capacitor, moreover when do I actually need one? when a certain amperage is reached?

Answered in the first line.... ALWAYS. No ands, ifs or buts (hee hee, I said buts )

I like big buts... is the way the song goes...
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Old 18th October 2007, 11:43 AM   #5
bega_83 is offline bega_83  Bosnia and Herzegovina
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Good question.... if you have an amp in your car (i assume u do) you could always use some extra power. The more the better...
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Old 18th October 2007, 11:51 AM   #6
built is offline built  Malaysia
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perhaps this would help.
read topic 46...

http://www.bcae1.com
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Old 18th October 2007, 12:32 PM   #7
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Quote:
perhaps this would help.
Thank you. I understand the purpose of a capacitor much better now but I feel as if it is not going to make that much difference.

Quote:
Why on earth would someone 'fess up' to wasting that much money on 'snake oil'. I've yet to see a capacitor make an audible difference.
I'm wondering whether a big 2 farad capacitor could compensate for a thinner wire such as 4 or even 8 guage. From reading that article it sounds like this is not the case.
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Old 18th October 2007, 12:42 PM   #8
djQUAN is offline djQUAN  Philippines
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I'm using two 1 Farad caps on my system and I can definitely say it's not snake oil.

why two? I have about 1600 watts RMS total and one was not enough. one cap would most probably suffice for simple one or two amp systems.
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Old 18th October 2007, 01:48 PM   #9
troystg is offline troystg  United States
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Rule of thumb is 1 Fd for every 1000 watts.

It is NOT snake oil, if you can't hear or tell a difference with a local supply cap near the amps you have bigger issues that the money spent on the cap(s).
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Old 18th October 2007, 03:26 PM   #10
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I've talked to a lot of people who purchased capacitors and virtually all were dissapointed because they could hear no difference. I've never seen an installation where the capacitor made a difference. Richard Clark did a thorough, controlled test that showed that a capacitor actually reduced the alternator's ability to recover after a large drain. There was absolutely no benefit to having the capacitor.

If a capacitor actually did something for an audio system playing music, manufacturers would demo a system with an A/B comparison. To my knowledge, none have.

The only time that a capacitor 'may' be of use is in a competition system where all you need is a 'burp'.

Instead of spending money on a capacitor, people should spend their money on a new alternator.
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