If your headlights dim every time your subs deliver a big bass hit, you could use a Tsunami power capacitor to stabilize the power between your amps and your car's electrical system. Tsunami makes high-power, competition-level capacitors that store up power, then deliver it to your amps when they need it most, during moments of peak demand. Your amps will maintain maximum performance even under extreme conditions.

Tsumani's HCAP-40 40-farad capacitor is suitable for systems totalling up to 20,000 watts RMS. This hybrid capacitor uses the latest battery technology to store more energy per cubic inch than a standard cap, and this reserve power gets delivered instantly to your amps whenever they need it. An LCD readout shows how much voltage is pumping through your system, while the amp-style chassis makes this cap look right at home with almost any amplifier setup.

Product Highlights:

  • 40-farad hybrid capacitor
  • blue LCD voltage/amperage meter
  • brushed aluminum amp-style housing
  • hidden connection set screws for neat installation
  • red flashing LED low/high-voltage warning
  • 1/0- and 4-gauge positive and negative wiring terminals
  • 13-1/16"W x 2-7/8"H x 8-1/4"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Tsunami HCAP-40 Reviews

Average Customer Review:

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Works great .....why discontinue it though?

Written By Lou, New Smyrna Beach Fl on Wednesday, September 03, 2014

I have a true 3,000 watt system and this thing handles it fantastic. I do have a 1500 cranking amp car audio battery under the hood as well but never a problem.

Pros: Easy install....looks great.....Does its job well

Cons: Its now discontinued

Tsunami HCAP-40

Written By bcarn, phx az on Wednesday, February 26, 2014

Crutchfield Customer Review (What's this?)

Does what its expected to do and looks good doing it. If your lights dim with this properly installed, you've got too much power. (is that possible?!?! Haha).

Pros: Looks good, functions well. Good sale price.

Cons: Feels cheaper than expected. Lack of instructions. Still, worth the money to prevent your amps from starving for power.

Tsunami HCAP-40

Written By slatts200, Norwell, Massachusetts on Monday, August 15, 2011

Crutchfield Customer Review (What's this?)

After installing myself, which was easy to do, the device seems to be regulating power as it should. So far, I'm pleased with its operation.

Hands-on research

What's in the box?

Download owner's manual

  • 40 Farad hybrid capacitor
  • 6 Mounting screws
  • Warranty/Wiring Card

Product Research


Overview: The overall response of your car audio system will be enhanced with the use of capacitors due to their ability to store a large amount of current and discharge it quickly to supplement your amplifier's power supply during high current demand (bass note). The Tsunami digital hybrid capacitor is a logical addition to your system due to the fact that automotive batteries aren't designed to deliver the current to satisfy the requirements of high powered audio components. It can also filter AC voltage induced in the system by the amplifier's power supply which could cause objectionable noise.

Note: One Farad of capacitance is recommended for each 500 watts of amplifier power, but you can never have too much capacitance for any system.

Digital Hybrid Capacitor: The Tsunami HCAP-40 is a 40 Farad high-performance digital hybrid capacitor with digital volt and amp meters. It provides two 1/0 or 4-gauge inputs and six 1/0 or 4-gauge outputs for installing a multi-amplifier system (up to three amps), totaling up to 20,000 watts RMS.

Styled Casing: The Tsunami HCAP-40 digital hybrid capacitor features an extruded aluminum case with chrome plastic accents. It also features a hinged cover to hide the capacitor's terminal connections.

Digital Volt and Amp Meters: The Tsunami HCAP-40 features a blue digital LCD volt and amp meter. Hi/Lo voltage is indicated by flashing red LED's.

Note: The Tsunami HCAP-40 has an operating working voltage of 20-volts (24-volt surge).

High-Current Terminal Blocks: The Tsunami digital hybrid capacitor features 1/0-gauge nickel-plated high-current terminal blocks with 4-gauge reducers. The HCAP-40 features one positive input, one negative input, 3 positive outputs, and 3 negative outputs.

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