I have recently bought 2 Kicker 07CVR10-4, They have an RMS Power Range:50-400 Watts and a max output of 800W, and a monobblock class D Pioneer GM-D7500M 800W amp. Im have a small battery in my truck and I know its just a matter of time until my subs kill it so im looking to get a capacitor and I know nothing about capacitors so im needing to know how what size i need to get as far a Fareds I guess? So any help is greatly appreciated.

Heres the links to what I bought if what I put wasent enough information.
http://www.onlinecarstereo.com/CarAu...07CVR10-4.aspx

http://www.onlinecarstereo.com/CarAu...GM-D7500M.aspx

 

That is actually a pretty efficient amp. But in terms of caps, the bigger the better. A 1 farad would be adequate for your purpose. Below is the link to a fairly decent deal on a 2 farad. That would be plenty with room to spare.


http://www.onlinecarstereo.com/CarAu...ik_PCX-3F.aspx

 

Thank you Teamramrod46, appreciate the help.

 

Capacitors for car audio are simply a temporary storage device and charge up from the alternator. THey drain just lke a battery and take time to recharge. Your issue is using more electricity than your producing. In most cases the smart money goes to more electrical production. Pushing your system hard will still tax the cap, battery, and alternator. Using a cap is really only if you have a few seconds of overdraw then the cap provides that support. There is little to gain unless you buy a cap the size of a battery, if you are going to push your system for long periods of time. You would be better off by getting yourself a alternator that will provide your needs that you will draw. Think in terms the factory alternator usually has about 10-20% extra above what your normal draw is, headlights, tailights, A/C heater blower motor and factory radio. Use this formula to determine your needs amps X volts = watts or watts divided by volts = amps.. Your stock alternator is about 80 to 100 amps... Just the aftermarket lets use 400 watts at 2 ohms... 400 / 12 = 33.33 amps draw. If you have another amp then add that draw, you will quickly see having a reserve capacity (cap) just ends up being a band aid...

 

^^ Agreed!

However, most people seem to forget that drawing power through 20 feet of power wire takes time....fractions of a second yes but its time nonetheless.
With a capacitor (properly charged) it acts the same way as the car battery, and with your amp wired directly to the capacitor and it only being 12-18 inches away from the amp itself, the time taken to send that power is drasctically reduced.....which results in better sound quality!

The alternator sends power to the battery which in turn sends power to the capacitor when it starts to reduce its capacity, which is better than constant power being sent to the amp straight from the battery to keep it running.