The 11 Best sub Amp Capacitors (2023 reviews)

Audiopipe sub amp capacitor is the epitome of what a great capacitor should be. It's a 6 carat compacitor good for a 6000 watt system. It features a low level input voltage of 20 volts and a high level input voltage of 24 volts. It protects your amplifier from voltage surges when you're playing your music loud. The cosmetic silver metal accent inside the cover can and will vibrate against the housing, but some glue will fix it.

This power cap will store temporary power and discharge it to stabilize the voltage to the amplifier, giving you more consistent power to your subs or speakers. It includes digital electronic protection and digital display with status indicator. This also eliminates dimming of the lights when the system hits hard bass. It is easy to install, and does a great job of keeping power to the amp headlights never dim.

Why We Like This:

A bit light dimming of course
Automatically turns off appropriately when needed
Holds more than enough power for two 3000 watt amps and kicker box

Best For Car Battery: Soundbox sub Amp Capacitor

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If you often find yourself scrambling for convenient and suitable capacitor, soundbox sub amp capacitor is your end point. This cap looks all fancy but does not perform, straight trash and that is where it s gon na go, the trash. It can take as little as a few seconds to charge. It improves quality of audio to add to that it is used to maintain correct power. It will kick its self on when you hit with the sub hard enough to start drawing power.

The capacitor is a battery for the amp power to start with the car battery. It helps your alternator out but does not push anything more. It auto turns off when your ignition is off and it reaches a certain level so your battery doesn’t drain. It shouldn’t take much longer than 5 minutes to fully charge the first time.

Why We Like This:

Great piece of car audio gear
Just an capacitor, like an battery is all its for stores power
Good brand reputation

Best For Good Price: boss Audio systems sub Amp Capacitor

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Compared with other capacitor in this category, the boss audio systems sub amp capacitor has a convenient design. The one thing that sets this apart from the others is that THIS ONE 18cap uses MUCH LARGER stiffening caps than ALL the rest. It can turn it up all the way at night with headlights and ac going, no dash lights or headlights blinking. It will also help keep your audio evenly powered and sounding good.

It comes with a digital voltage display. It is easy to hookup, just make sure you follow the directions and charge it correctly with the included part. It will not stop your headlights from dimming when the bass hits, but it will help.

Why We Like This:

Good brand reputation
Good investment for long term

Best For almost every needs: pyle sub Amp Capacitor

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The pyle sub amp capacitor is suitable and reliable and fits well with your daily usage. It works great with german vehicles with sensors especially if you have an agm battery. This amp is top of the range from alpine. It can only provide the right amount of voltage coming in for both units. Once your main battery is charged, it'll charge up the capacitor and you'll be set.

Hi, this unit will provide the right amount of voltage coming into all devices connected to your car battery. It is easy to instal, easy to charge, and keeps the beats coming. This is plenty enough head room to even add more power and no issue.

Why We Like This:

Digital voltage indicator is nice and bright
Has built in over/under voltage alarm as well
Highly recommended for anyone who is into subs, and amps that are high powered
Produce the adequate power but very fragile terminals

Best For systems: recoil sub Amp Capacitor

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We would, of course, be remiss if we didn't mention recoil sub amp capacitor for regular usage. It is a 1000w 2 channel pioneer running at 2 ohms. It improves sound quality for cleaner mids and highs. They are just long enough to connect the positive and negative terminals, FYI. It is perfect for systems up to 1000w. This cap comes with the resistor board for first charge and easy to follow instructions. It turns off automatically. If you want a good capacitor this one is perfect for 1000 watts or below.

Why We Like This:

Display turns of when ignition is off
Interior light dimming as they are the most sensitive
Simple to connect, no signal wire required
Braided looking metal wire on the block and car body

Best Cap: Bullz Audio sub Amp Capacitor

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The bullz audio sub amp capacitor's material feels more premium than its price would suggest. It's great capacitor for both rockville amps db25 and sdb. It connects like the old caps and the resistor is for charging only. It also has an auto shut off feature and LCD volt meter. It's perfect for 4 channel amps. It just turns on when the power fluctuates and turns off when it discharges all the way. It includes mounting brackets and allen wrench for tightening terminals.

Why We Like This:

More grounds is better power loss
Nice clear instructions and easy to install
Lot of satisfied buyers

Best For speaker: Power Acoustik sub Amp Capacitor

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Power Acoustik is known for creating pragmatic and minimalist capacitor for people on the go, and its line of power acoustik sub amp capacitor definitely falls in line with that reputation. Honestly if you're running one or even two subs off of a single lower power amp, this is a great investment and you will hear it right from the start. It functions as a amp main power source so it doesn't suck up battery power. It includes mounting brackets. It hits the notes perfectly and smoothly. It's also nice to have a voltage display on it. The posts strip out rather easy so be careful not to tighten them too much during installation. It won't drain your battery if it stays on.

The terminals are really solid.

Why We Like This:

Comes with platic mounting brackets, so don't overtighten screws, or you'll be screwed
Very solid, no more headlight dimming
Sound system working at peek performance

Best For Car stereo: Rockford sub Amp Capacitor

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The rockford sub amp capacitor has killer features for the price point. A capacitor will provide quicker power to your amp for harder bass hits and will smooth out the shock to your electrical system but they are not a band-aid for a weak factory electrical system. It helps to supplement your primary battery which charges and discharges at a much slower rate. The Caps can supplement the needed power draw that exceeds the battery and alternators max output Rate, then the battery slowly charges the cap and the alt keeps everything up to snuff.

If you jam hard, this cap will save you premature alternator failure for sure. This capacitor is used to regulate (smooth out) the voltage in your system. This keeps your system running smoothly and can prevent distortion and electronic malfunctions.

Why We Like This:

More dimming lights on the dash
Zero dimming and sounds still sound awesome
Easy install, works great, great value for money

Best With stock charging system: T-Spec sub Amp Capacitor

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Best part: t-spec sub amp capacitor costs comparatively low and it is available to ship in 24 hours. It improves electrical system performance by providing a buffer between the alternator and amplifier. It prevents dimming lights when your subs or speakers hit and it makes it easier on your alternator. The LED screen looks pretty sweet too. It draws power from the battery. The package comes with everything you need to install, minus the user having to supply the 4 awg / 4 guage power ground wire. It includes two brackets and four screws. It will take the stress off the alternator. It also better to be closer to your amp for a shorter electrical run from the capacitor to the amp.

Why We Like This:

Nothing too special, just standard clear plastic brackets
More dimming lights on the truck when bass gets going
4 -gauge is a perfect fit

Best For smaller system: stinger Select sub Amp Capacitor

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Next on the list, we've got yet another capacitor that manages to win our hearts. It's the stinger select sub amp capacitor and it's widely considered as one of the best convenient capacitor you can buy. The best thing to get is an adequate alternator with a higher amperage. It comes with two clear plastic mounting brackets shaped like a U. It’s a very nice capacitor with no instructions on how to initialize it with a resistor bulb but you can download pdf online and get it’s pretty simple. It includes the needed resistor, which is a small light bulb. It looks solid and it’s big too.

It’s good for systems up to 2000 watts. The integrated digital display informs you of system status and performance.

Why We Like This:

Good digital capacitor, easy to install, work great
Good brand reputation

Best Feature: Easy To Install: NVX sub Amp Capacitor

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Compared with other capacitor in this category, the nvx sub amp capacitor has a convenient design. It has more electrical conductors than other competitors. It includes a mounting bracket for a secure and easy installation. It allows to handle any stero system easily up to 1200 watts of power output.

Why We Like This: