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A capacitor is a passive (it consumes, but does not produce, energy) two-terminal electrical component. In building a sound system for your car, you would want to use a capacitor for a couple of different reasons.

The main reason a capacitor is always recommended is for power reserve. The capacitor stores energy and releases it very quickly to the amplifier(s).

Music is dynamic, no matter what type you listen to, and the dynamics can vary quickly, going from soft voices to thundering bass notes. These moments are where the benefit of having a capacitor is heard. The amplifier requires a constant amount of steady power to function efficiently and power the speakers. A capacitor will keep the power going to the amplifier consistent and stabilized, which means a better-sounding system.

Important: The remote output of the head unit is connected to the remote turn on of the capacitor. The capacitor will not function if the remote wire is not connected to your head unit.

Model 2 Farad 3.5 Farad 4 Farad 8 Farad 30 Farad Color Dimensions
(L x W x H) CAP2B • Black 3″ x 3″ x 10.30″ CAP3.5B • Black 4″ x 4″ x 11.37″ CAP3.5S • Silver 4″ x 4″ x 11.37″ CAP4C • Chrome 4″ x 4″ x 11.37″ CAP8 • Black 9″ x 6″ x 2″ CAP30 • Black 11.38″ x 7.25″ x 3″ WHAT’S IN THE BOX
* One pair of mounting brackets
* 2 ring terminals
* 2 spade terminals
* Mounting screws
* 1 resistor
* 1 Allen wrench

* Installation
* Power up procedures
* Power down and removal

Technical Specifications

Product Dimensions10 x 5 x 2.5 inches
Item Weight4.4 pounds
Item model numberCAP8
Batteries1 12V batteries required.
Customer Reviews4.3 out of 5 stars 2,679 ratings 4.3 out of 5 stars
Best Sellers Rank#40 in Car Amplifier Capacitors
Is Discontinued By ManufacturerNo
Other display featuresWireless
ManufacturerBOSS AUDIO
Date First AvailableJuly 15, 2008
Capacitance8 Farad
BrandBOSS Audio Systems
Operating Voltage24 Volts
Capacitance Tolerance10
Maximum Voltage24 Volts