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Sound Storm Laboratories

Sound Storm Laboratories C352 Car Capacitor, 3.5 Farad, Energy Storage

Based on 1,093 reviews
Condition: New
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$47.90

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Availability: In Stock.
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Arrives Sunday, Nov 1
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At a glance

Condition
New
Style
3.5 Farad
Model
C352
Weight
2 kg
Material
Aluminum, Plastic
Capacitance
4 farad
Shape
Round
In the box
3.5-farad Capacitor With Digital Display (black Finish)
Warranty
1 Year Warranty

Features 7

  • Red digital voltage display
  • Low E.S.R. (Equivalent Series Resistance)
  • 16 V / 20 V surge
  • Audible warning tone for reverse polarity

Description

View largerWHAT IS A CAPACITOR?A capacitor is a passive (a component that 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 always recommend, is for power reserve. The capacitor stores energy and releases it very quickly to the amplifier(s). How does this help? It’s very simple: Music is dynamic, no matter what type you listen to. The dynamics in musical content can vary from soft voices, and very quickly transition 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.SPECIFICATIONS1) 3 Digit, Super Bright Red LED Voltage Meter 2) Capacitance (microfarads): 3,500,000 3) Working voltage: 20VDC 4) Surge Voltage: 24 Volt 5) ESR : ˂0.00195 Ohm @ 120Hz, 25ºC 6) Capacitance tolerance: +/- 10% 7) Chrome Plated Posts 8) Dimensions: H 11-3/8” x D 3-15/16” Charging The Capacitor View largerCHARGING THE CAPACITORFirst make sure that all the connections according to the diagrams in the instruction manual are correct. Pick up the cable coming from the POSITIVE (+) battery terminal. Place the supplied charging resistor between the end of this cable and the positive terminal of the capacitor. The capacitor will begin charging. Charging generally takes 5 to 60 seconds. During charging, the voltage shown in the 3 digit display will rise rapidly, then slow as it approaches the voltage of your vehicle’s battery. When fully charged, the display voltage will stop rising. If you have a voltmeter, you can first measure the voltage of your car battery. Then you will know with accuracy that the capacitor is fully charged. CAUTION!! During charging, the resistor will become hot. This is normal, but exercise caution during the charging process. After charging is complete, remove the resistor from the incoming positive cable, and IMEDIATELY connect it to the positive terminal of the capacitor.View largerWiring View largerView largerView larger

Specs 20

Capacitance 4 farad
Brand Sound Storm Laboratories
Material Aluminum, Plastic
Shape Round
Operating Voltage 16 V DC
Item Shape Round
Capacitance Tolerance 10 %
Maximum Voltage 24 volts

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Nov 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Top Amazon Reviews

Easy installation.
Style: 3.5 Farad
This is a great capacitor. It is very easy to install. As long as you follow the directions. It definitely stopped my headlights from dimming when the base hits from my amplifier makes no difference if you have two car batteries or a high put alternator I think you still should get one of these just to have some reserve. It works for me. It might work for you. Try it out I love it. ... show more
Reviewed in the United States on November 25, 2025 by Reginad Lowe
Would buy again
Style: 3.5 Farad
Took forever to charge. Wouldn't charge on the car I was using which is a hybrid. Was stuck at 9.7v. Hooked it up to my Yukon and it finally started to go up. Works good besides that. Volts drop as it is needed and jumps back to normal almost instantly. Would buy again and a great price.
Reviewed in the United States on September 2, 2025 by Michelle Myers
Awesome Capacitor
Style: 3.5 Farad
Review Image by Juan
Review Image by Juan
Review Image by Juan
Review Image by Juan
Don't listen to any of these reviewers stating that it's not a super/ultra-cap (which the product states its just a capacitor, nothing more) or the ones stating it doesn't last long and such. Chances are they either misused it or installed it improperly. I've had two of these 3.5uf capacitors providing supplementary power to two 1600watt amps, that's one cap per amp, I've had no issues. Fully charged they each hold about 14.7v, during standard music playing like using the radio tell drop to about 11.5v-12.5v, during heavy usage like playing heavy bass music it has only gone as low as 9.5v-10.5v. When my car is off, I can do heavy usage for about 45min to an hour and 1.5 - 2 hours of standard play. As soon as the car comes on, the recharge is instant. both caps have a low voltage tone which comes on when the voltage drops below 9v which I've tested by running both amps off of one cap. All in all, these caps are great for beginners or just those who don't have big systems. Of course, if you plan on going big, then I would recommend getting a super/ultra cap which usually looks like standard car batteries. But if you have limited space or you don't have the need for such high-end applications, these caps are the way to go. ... show more
Reviewed in the United States on September 29, 2020 by Juan
Ok
Style: 3.5 Farad
Works ok definitely helps bass after the kick drum Wish I had enough to go with a super cap instead but this is ok for the price
Reviewed in the United States on January 8, 2026 by Jordan Cremer
Great product - high quality - great price
Style: 3.5 Farad
What a difference in maintaining a constant voltage level with no more draw and dimming lights. My audio quality is 10x better with a deeper base from my SUB. Working flawless since install with NO ISSUES! Worked better than what a lot of the reviews stated. DEFINITELY A BUY!!!
Reviewed in the United States on April 25, 2025 by David H
Make sure you match your amp with capacitor or will fry it..
Style: 3.5 Farad
Review Image by Luis Cancel
This capacitor is no joke, it fried one of my amp to drive 1200 watts but amp is rated at 800 watts that came with mtx terminator combo it needs to match a higher amp for my 12k subs..love turn off and on feature through your receiver..
Reviewed in the United States on April 18, 2026 by Luis Cancel
Works well
Style: 3.5 Farad
Never bought one before. Kind of nervous to buy the right one. I ended up getting this one and I'm running two 10-in subwoofers off of competition and headlights don't dim, the lights are neat comes with mounting brackets. Works well
Reviewed in the United States on August 15, 2025 by Ben McAfee
Doubtful that it's 3.5F on my sample
Style: 3.5 Farad
Folks, I believe this a large ELECTROLYTIC capacitor. I don't think it's a bunch of Maxwell-style Supercaps or Ultracaps. That means this is one huge long set of metal foils with electrolytic paste between the layers. They are probably wrapped in a long spiral cylinder. For you EE types, all that foil implies a fair amount of series inductance which interferes with instant response to current spikes. Consider connecting a smaller electrolytic cap, say 4700 uF (with 35V working voltage), wired in parallel right across the big terminals or right at your load. That will give better transient response. I am an EE and my comments below probably apply to all similar competitive "Car Radio Capacitors". Here are some observations: [1] If this was really a 3.5F Supercap or Ultracap, it would be FAR more expensive. So electrolytic fabrication is a reasonable idea IF it is built and tested properly. Considering the low cost, I now have my doubts. "Sometimes you get what you pay for". [2] However, that electrolytic paste can dry out, leak and/or partially separate from the foil plates over time. That could happen especially in the hot trunk of a car heated by a nearby kilowatt amplifier.That deterioration of the paste causes less capacitance therefore you should test it often. It also means this product may have a limited life. If you open the trunk and find this cap hot, you might have BOTH reduced capacitance AND a safety issue. The "instructions" hint at all this by recommending that you make sure that there is no fluid leakage from the top vent. Note that high heat or foil separation damage could occur in shipping from China. Do they test them when they arrive?? Other damage could include hidden detachment of the foils from the internal bus. My packaging showed no damage. [3] I tested this and it is WAY less than 3.5 Farads. The supplied 51 Ohm resistor charges this cap using 12V / 51 Ohms or about 1/4 of an Ampere (250 mA), initial charging rate. I called SSL and they said it should charge in about a minute using the supplied resistor. Using only 1/10 Amp (100 mA - LESS than the supplied resistor), I only took about 15 seconds to charge to +12V. Less current and less time means this is MUCH less than 3.5 Farads. There is a very rough rule of thumb here: 1 Amp causes a 1 Volt rise in 1 second in a 1 Farad cap. Also note that the DVM decimal points did not blink during charge up as the "Instructions" state. [4] The two large silver plus and minus terminals go directly into the cap body. I cannot see any intervening MOSFET or other circuitry in series with those big terminals. That makes sense since a LOT of current might quickly exit this cap on power spikes. That direct connection implies that the little DVM is not required to use this as a capacitor (but is useful for SAFETY). I tried it both ways and there was no difference. As mentioned elsewhere, don't overtighten these terminals. [5] The small silver screw third "remote" terminal must be connected externally to +12 Volts DC. The remote is ONLY to power the DVM, nothing else. The return for this DVM board is the large minus terminal. My DVM seems to work okay. You may want to install a switch between +12V and the "remote" terminal if not already included in your radio. The DVM certainly eats a little current. Obviously the DVM will not wake up until there are most of 12 Volts at the remote terminal. All of this is NOT clear in the Instructions. Hey folks, why should a customer have to finish the "documentation" ?? If you order one of these, you may luck out and get a good one. I will not return mine because of the high cost of return shipping (it's heavy!!). Also I don't want to take a chance and get another lemon. I'm giving this one star because the idea is good but the quality control, as the customer receives it, is questionable. ... show more
Reviewed in the United States on May 31, 2018 by LDCRC
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