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SoundBox

SoundBox 4 Gauge Amp Kit Amplifier Install Wiring & 2.5 Farad Digital Capacitor, 2300W Peak

  • Based on 2,092 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Oct 17
Order within 9 hours and 54 minutes
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Features

  • SoundBox Combined Amp Kit & Capacitor Package
  • Give Your System the Wires It Needs and the Capacitor It Wants
  • SoundBox 2.5 Farad Digital Capacitor
  • SoundBox 4 Gauge Complete Install Kit Rated at 2500 Watts Peak

Description

General Features: SoundBox Combined Amp Kit & Capacitor Package Give Your System the Wires It Needs and the Capacitor It Wants SoundBox 2.5 Farad Digital Capacitor SoundBox 4 Gauge Complete Install Kit Capacitor: 2.5 Farad Digital Capacitor 2500 Watts Peak Power Rating Digital Display Readout Amp Kit: Complete 4 Gauge Amp Install Kit 2300 Watts Peak Power Rating Heat Resistant Wire Jacket Premium Heat Durability In-Line AGU Fuse Holder Triple Shielded RCA Interconnect Cable Premium Grade Cables Included: SoundBox 2.5 Farad Digital Capacitor 4 Gauge Red CCA (Copper Clad Aluminum) Power Wire: 17 Feet 4 Gauge Black CCA (Copper Clad Aluminum) Ground Wire: 3 Feet Black/White RCA Interconnect: 17 Feet 16 Gauge Brown/Silver Speaker Wire: 17 Feet 18 Gauge Blue Remote Wire: 18 Feet Protective Black Wire Loom Inline AGU Fuse Holder i80 Amp AGU Fuse Installation Accessories/ Connectors Terminals, Wire Ties and Wire Loom Included

Manufacturer: SoundBox


Mounting Type: Surface Mount


Brand: SoundBox


Number of Channels: 4


Package Type Name: Box


Mounting Type: Surface Mount


Number of Channels: 4


Package Type Name: Box


Maximum Output Power: 2300 watts


Material Type: Aluminum


Specification Met: FCC


Manufacturer: SoundBox


Model: SCAP2D+ECK4


Brand Name: SoundBox


Number of Items: 1


Unit Count: 1 Count


UPC: 859256005921


Part Number: SCAP2D+ECK4


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Oct 17

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

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Top Amazon Reviews

    • Don’t shock your self🤣
I love it so fab
Reviewed in the United States on August 12, 2026 by Jackson hines
    • Cap works !
Solid no issues! And my amp and subs never cut off. I always get a strong current and strong bass!
Reviewed in the United States on May 27, 2026 by Camry
    • Things to know
Firstly, Mine was professionally installed by the company that i got my system from a number of years ago, i was finally able to install it a few days ago. They used what came in the box, nothing else had to be purchased, in my case anyway, so this having everything you need MIGHT vary here and there. Though i did buy a current generation fuse holder to replace the older one, but that was my choice as it was nearing 10 years. Kind of amazing how small the fuses are now while having the same rating of its larger counterpart. Secondly, maybe its a given, i dont know, but so people are aware, the Cap only Turns On at a certain Voltage threshold, so there does have to be a certain amount of power draw on the Battery for the Cap to kick in. Which i was under the impression that if the Head unit was turned on and thus communicating with the Amp the Cap would always be On as long as the Head unit was, which does not appear to be the case. So for me, my Cap was correctly installed and does Work. If yours doesnt, you could have gotten a Dud, sure. But its also possible you didnt install it correctly. A Disconnect Switch would probably be a good thing to add as the Cap still gets the battery voltage even in its Idle/Off mode. 1 Final thing of note, the Blue LED is Very Bright so depending on the direction its pointed at you may need to cover it So far its doing what its supposed to, only time will tell if i remove it or keep it. Edit: The 4 AWG Wire it comes with is CCA and VERY hair like Thin, while it does do the job the strands are practically brittle. Get higher quality cables and youll be good to go. ... show more
Reviewed in the United States on November 22, 2025 by CJ
    • Good product.
Easy installation, And helped my drain on my battery a lot, Worth buying if you have a small system, this was plenty for my 1 12” sub much more and a battery would be better I would say.
Reviewed in the United States on January 25, 2026 by Audrey W.
    • The kit you need for amp install!
Make sure you also order a power distributor to split the power line before wiring amp & cap. And maybe another ground as 3ft wasn't long enough for both amp and cap for my install. I was quoted hundreds of dollars to run a new power line from battery to amp, much of it was labor hours, but both places charged TWICE THE PRICE just for the amp wiring kit. NOT INCLUDING CAP! So glad I decided to run this myself, especially as my '09 Rav4 driver side firewall grommet already had a hole punched that fit the 4GA wire! Might be slightly more difficult if you need to drill new hole, but if you're AT ALL handy, you can YouTube & DIY easy enough. Definitely took a few hours to pop off all the interior side panels, the stereo head unit, and run the wires, but nothing too technical or mechanical or requiring specialized tools and totally worth the afternoon in the driveway/garage. ... show more
Reviewed in the United States on January 26, 2020 by Phil Doughty
    • good deal with what's included
After everything was said and done this kit turned out to be a great choice. some wiring it's alone are ~30 and a 2.5F cap is another ~30 so this was a no brainer buy when needing a wiring kit. the cap instructions are kind of confusing because it seems like it's still charging and the number should rise from blinking 0.0. but it won't. though it does say 5-20 seconds with the resistor I thought it wasn't working right. but after leaving it on for about 20 minutes I hooked it up to my battery and it worked perfectly. the wires are great and plenty. I actually was able to hook up and ground two amps with the kit, but I have a smaller vehicle and my grounds are very short. ... show more
Reviewed in the United States on January 27, 2020 by Noah
    • Not complete Kit. Need to purchase additional parts to work ( not included) see post. .
As a "KIT" this is not complete.. Per the instructions, you will be required to install an addtional 4guage power/distribution block splitter .( could had added to kit, they are 10$). also "IF" following instructions, they do not supply enough crimp connectors for the 4guage.. ( only 2, need at least 4-6 with a power distibution block installed as well, they include extra very samll useless blade connectors , maybe 12guage, i see no purpose of them inthe kit) . Since it did not come with a distribution block i cannot complete install untill order for that missing part ( not supplied) comes in to test actual Capacitor.. Will update.. FOr now.. JUSt FYI.. NOT a Compelte kit. .. ... show more
Reviewed in the United States on March 11, 2025 by fishnut
    • Really slick looking definitely a professional looking item
This is really something you need I know the price seems too good to be true but so far everything's been great it definitely boosts the power up I must have for anyone that owns an amp
Reviewed in the United States on April 27, 2024 by James Bradyjr

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