BOSS Audio CPBK2 – 2 Farad Car Capacitor For Energy Storage To Enhance Bass Demand From Audio System

Included pieces
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What Is A Capacitor?

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.

Why Do I Need One?

The main reason a capacitor is recommended is for power reserve. The capacitor stores energy and releases it very quickly to the amplifier(s). How does this help? Music is dynamic, no matter what type you listen to. The dynamics in musical content can vary from soft voices to thundering bass notes. These moments are when 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.


  • Capacitance: 2,000,000 (2 farad)
  • Capacitance tolerance: +/- 10%
  • Working voltage: 16VCD
  • ESR (equivalent series resistance): <0.00195 mW @ 120Hz/25ºC
  • Head screw terminal type: ¼”-28 UNC thread
  • Dimensions: 10-7/16” L x 3” diameter

Wiring Connections
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What Comes In The Box?

  • One pair of mounting brackets
  • Two ring terminals
  • Two spade terminals
  • Mounting screws
  • One resistor
  • One Allen wrench

Product Features

  • 3 Digit Bright Red Digital LED Voltage Display
  • Audible Warning Tone for Reverse Polarity, Voltage Overload and Low Battery Voltage.2 Farads with digital voltage display
  • Capacitance: 2,000,000, Capacitance Tolerance: + / – 10%, Voltage Measurement Accurate to + / – 0.1 VDC
  • Working Voltage: 16 VDC, Equivalent Series Resistance: <0.00195 mW @ 120 Hz / 25°C
  • Dimensions: 3 x 3 x 10.3, Unit Weight: 3.8 Lbs
  • 1 Year Warranty

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2 Responses to BOSS Audio CPBK2 – 2 Farad Car Capacitor For Energy Storage To Enhance Bass Demand From Audio System

  1. Anonymous says:

    Nice looking, but horrible performer, low readings…. Cap is very impressive looking, but when tested with laboratory equipment, it’s almost a total failure. It’s printed 2.0 Farads on the cap, but when measured on lab standards, it’s a big zero, it reads only 0.4 Farads, and that’s after a 48 hour break in period at 15 volts and 100 complete charge/discharge cycles with a 10 ohm load. Don’t trust the over blown ratings. It also has about 50mA current leakage which slowly drains the cap after charging. You better buy at least 5ea of these and…

  2. Anonymous says:

    I measure ~20% of advertised capacity. I just tested the one that I received. I get 0.4 farad, or 20% of the value printed on the can. It would be analogous to ordering a pint of beer and getting a glass with 3.2 oz in the bottom. I would have considered it a defective part, but others who have gone to the trouble of measuring the actual capacitance of these things seem to be getting similar values. I suspect shenanigans. How can this happen?I bought this part because I needed a pulse power supply in my lab, and quick…