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T-Spec Capacitor

1.5-farad capacitor with red LCD meter

Item #: 12015DDC

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17 Reviews | 5 questions - 14 answers

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Smooths out the bass

T-Spec's 1.5-farad capacitor will help your vehicle's charging system keep up with your high-powered sound setup. When the power of the bass threatens to overwhelm the electrical system, this cap quickly provides a jolt of stored power to keep the beat pounding and your headlights from dimming. And it recharges quickly, so it's always ready for the next hit.

Displays the voltage

A bright, digital meter displays your system's voltage, so you can monitor how things are going and avoid overtaxing your vehicle's charging system. We recommend this 1.5-farad cap for any sub amplifier delivering up to 1,500 watts RMS. Warranty: 1 year. 

T-Spec Capacitor Reviews

Average Customer Review:

17 Reviews

Power reserve and cool and useful LED display

Written by: MikeM from Virginia on January 9, 2016

Crutchfield Customer Review (What's this?)

This is my third subwoofer installation. I've been an audio hobbyist since the 60's and am a repeat customer at Crutchfield.

- T-Spec 1.5 farad Capacitor The LED display/lights are pretty cool and useful and the input terminals are large. I used 4AWG power cables. You will need an allen wrench for the terminals. There was no resistor or light bulb supplied with this product for initial charging. I had to use a large old resistor (100 ohms) to initially charge.

Used with: - Pioneer TS-W311D4 12" dual voice coil subwoofer - Sound OrdnanceT Bass Bunker BB12-125S sealed enclosure, 1.27 cubic feet - Rockford Fosgate Power T600-2 - Rockford Fosgate RFK4 wiring kit

Pros: Size, power terminals Cool and useful LED display

Cons: There was no resistor or light bulb supplied with this product for initial charging. I had to use a large old resistor (100 ohms) to initially charge.

Needed with any high watt system

Written by: Rob from New Jersey on December 11, 2015

Crutchfield Customer Review (What's this?)

Looks coola nd functions great. Comes with mounting hardware and directions. Pretty simple to anyone that diy. Keeps y headlight stable when im at max. 1000 watt amp to two kicker 12s

Pros: Voltage reading, leds and mounting brackets

Cons: You have to supply the recomended distribution block (not too expensive and keeps things clean) interior lights still dim at times

What I needed, wrong container

Written by: Anonymous from Miami on October 22, 2015

Crutchfield Customer Review (What's this?)

What I needed just wrong container, a tad too long, had to modify a little the area, but at the end, is doing its job perfectrly



No bad

Written by: MJ from Illinois on May 31, 2015

Crutchfield Customer Review (What's this?)

Love it my sistem runs like a champ my head lights does not dim down with the bass Playing At max volume this capacitor it looks cool and does his job.



t spec cap

Written by: nickdio from norwich, ct on April 12, 2015

Crutchfield Customer Review (What's this?)

Works great

Pros: Led display, comes with mounting hardware and easy to fillow directions, great price

Cons: Doesnt give accurate voltage reading

Great product

Written by: Teka from Texas on February 19, 2015

Crutchfield Customer Review (What's this?)

Works well and my lights dont dim. Helps stabilize my amp. I have a very old punch 250a2 that draws a lot of current and this help a lot.

Pros: looks great, works great.


Works as expected

Written by: Brent from Doylestown, PA on October 12, 2014

Crutchfield Customer Review (What's this?)

The capacitor came with it's own distribution block which made installation a breeze. LED lights look great and the cap works as expected.

Pros: Easy to install, looks great

Cons: None

The service is great. This product helped with the lights dimming,but

Written by: Wick from Okc ok on October 7, 2014

Crutchfield Customer Review (What's this?)

Good but there is better.

Pros: Really does work.

Cons: Lights are still dimming.

Great product

Written by: Neno from Mount Prospect, IL on August 2, 2014

Crutchfield Customer Review (What's this?)

The product works great. LED voltage reading is a nice feature. This unit doesn't have a 3rd terminal, which was something mentioned in another review (not sure if it was on here). It's a 2 terminal cap.

Pros: Does what it should. Includes enough hardware.

Cons: None yet.


Written by: Bige94 from Wakeeney kansas on July 18, 2014

Crutchfield Customer Review (What's this?)

This item is great and easy to install comes with everything needed it really improves bass response

Pros: Easy install All parts included Bright led display

Cons: None


Written by: Anonymous from Brooklyn NY on July 5, 2014

Crutchfield Customer Review (What's this?)




Nice unit

Written by: Anonymous from Lincoln Ne on July 1, 2014

Crutchfield Customer Review (What's this?)

Nice cap, easy to set up, clamps are a bit cheesy. Keeps my lights from dimming.



T-Spec Cap

Written by: Jason from Sterling va 20164 on April 30, 2014

Crutchfield Customer Review (What's this?)

Looks awesome and does exactly what it needs to do!




Written by: kenp from Bradenton fl on April 19, 2014

Crutchfield Customer Review (What's this?)

Does what it is suppose to do

Pros: Works well Nice led numbers

Cons: Massive.

cool looking

Written by: joe from va. on March 24, 2014

Crutchfield Customer Review (What's this?)

love the look of this thing,does what it's suppose to.its just the wow factor of seeing it.



T-Spec Capacitor

Written by: mfolta from Laddonia, MO on December 16, 2013

Crutchfield Customer Review (What's this?)

I'm certain the capacitor will do the job that it is intended for, just for my application I do not like it.

Pros: 1.5 Farad should prevent the head lights from dimming.

Cons: No protective cover for the power terminals-must be mounted with decent clearance to prevent shorts.

Helps out

Written by: Anonymous from Ms on August 19, 2013

Crutchfield Customer Review (What's this?)

Does what it says. Helps out with headlights dimming and keeps voltage up about 1.5 volts more than without.

Pros: Does what it claims

Cons: Big and bulky. Needs to be smaller.

Hands-on research

What's in the box?

Download owner's manual

  • 1.5 Farad capacitor
  • 2 Polycarbonate mounting brackets (installed)
  • 5mm Allen wrench
  • 4 Self-tapping screws (5/8" length)
  • 8 Flat washers
  • Resistor bulb
  • User's Manual

Product Research


Overview: This T-Spec v6-series digital capacitor will improve the performance of your car's electrical system by acting as a buffer between the alternator and your amplifier. Stored energy from your car's electrical system is held in the cap and quickly released to the amplifier when needed. High current demand occurs when the music you are playing contains a loud, transient, deep bass signal.

Capacitance: This T-Spec v6-series digital capacitor has a rating of 1.5 farads. While you can never have too much capacitance, it is recommended that you use a capacitor with a minimum of 1 Farad for each 1000 watts of amplifier power.

Terminals: The capacitor features an impact-resistant polycarbonate cover with two terminals on the top that can be tightened/loosened with the supplied 5mm Allen wrench. You should use power and ground cables that are equipped with ring terminals with 1/4" diameter or larger holes.

Voltage Meter: This capacitor has a digital voltage meter on the top to help you monitor your electrical system's performance.

Reverse Polarity Protection: If the capacitor is wired incorrectly, you can damage your equipment or electrical system. To prevent this, the capacitor has an internal relay system which disables the capacitor and triggers a buzzer to sound.

Resistor Bulb: The capacitor comes with a 1/2-watt, 1000 ohm resistor bulb which is used when initially charging the capacitor, and to discharge the capacitor when removing it from the system. You should keep the resistor bulb in a safe storage location when not in use.

Mounting System: The cap comes with a simple mounting system that lets you mount the unit vertically or horizontally, using the four supplied self-tapping screws.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

5 questions already asked

No. Your capacitor will stay charged as long as your alternator is good. [ DAVID  Sep 26, 2015 ]
Im not an EE, but capacitors store energy and it acts as a buffer between your stereo and the electrical system in the car. If your Battery drains, and/or is replaced, it will automatically store up energy again once you fix your battery. Capacitors are in appliances, computers and a whole bunch of things. [ MICHAEL  Sep 23, 2015 ]
Depends on how long your battery is dead. If you already have it installed, just replace the battery and it will draw what it needs. If you're reinstalling after installing a battery use a 1k-ohm resistor to trickle charge it. honestly you don't have to trickle charge it but you'll get a large spark if you don't. [ ROB  Sep 23, 2015 ]
NO, I had to buy a new battery about four months after I bought my capacitor, alp I had to do was hook up the new battery and I was good to go. [ RICKY  Sep 23, 2015 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Krissy  Feb 22, 2015 ]  Staff
Yes. Run the power wire connection from your battery to a power block, just connect the capacitor to the block and the amps to the block as well (the amps will draw from the cap if it needs current. I bought the capacitor after a lot of research and concerns with my cars electronics. I ran into some power problems that wound up being a bad ground from my amps to the car. Along the way I purchased a new XS power battery which helped a lot. I have an F150 and the alternator kept up with the demands of my system (I have alpine 600w x 1 sub amp, and a 100w x 4 amp). I don't even get a voltage drop out of the capacitor now even if I am running the system and all of my car's electronics. Long story short, I don't know if I needed the cap in my truck with the new xs power batter, but I think it was a smart move . [ COLIN A  Sep 09, 2014 ]
yes it can thats how i have it set up now just get yourself the wire connectors and little extra wire and youll be ok [ AFRIM  Sep 09, 2014 ]
yes it can. the capacitor isnt what is powering the amps but it acts as a storage device and it works great. [ THOMAS  Sep 08, 2014 ]
What size amp are using too? [ Nick  Jan 11, 2016 ]
You will install this as close to the amp as possible. You will need wiring as big or bigger than your 4 gauge and you will need a distribution block to wire this in. This does not wire in line with the amp. And make sure you read the instructions on hook up, charging and discharging. [ TYLER  Dec 18, 2013 ]
positive [ JOSEPH F  Dec 18, 2013 ]
Positive to battery positive. [ DAVID  Dec 18, 2013 ]
Connect the power wire from the battery to the positive terminal on the capacitor. Use heavy gauge power cable, number 4 car stereo power cable if I'm not mistaken. Run the power cable to the amplifier from the positive terminal of the capacitor. Simply ground the negative side of the capacitor to your chassis, make the ground #4 power cable also and as short as a lead as possible. [ Billy  Dec 18, 2013 ]
The positive(+) terminal hooks to the battery. Take time to read the instructions for this item. One thing I didn't notice is that you will need a distribution block to wire this in. You don't wire this in line with the amp. Hope that makes sense. The instructions will tell you how to wire it in. [ TYLER  Dec 18, 2013 ]

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