Belva 1 Farad Capacitor with 4 Gauge 2-Channel Amp Kit (B1DK42R)

The Belva BB2D works great. But first, lets get the little stuff out of the way. The resister for first charge (and discharge if necessary) is incorrect in some way. The guy in the Q n A who used his test light nailed it. my resistor did not work and I used this idea and it worked like a champ. Basically put any type of resistance (like a light bulb) in series with the positive for the first charge (or across the + and - to discharge for safety) or if it has been discharged to work on system. Cap's store a lot of energy, these techniques are important.Discharging. (Decreasing voltage when stereo is turned off) A cap will naturally decay when no power is flowing. Decreasing voltage until the circuit board shuts it off at 9.5Vdc (I believe that's correct, but hey, no quotes) is normal. This way the cap is still 3/4 the way full when the system comes on. This is why you charge slowly with "resistor" (pronounced Light Bulb) the first time, the cap is empty. this stops the cap from over taxing your electrical system each time you start your car.Blue light. Cover it. Be creative.Why I am writing this review. I enjoy my music. I have been into car stereo for some time and have installed about a dozen systems. All under 1000W systems. About 5 years ago I built a 1600W system All JL Audio amps. This system included a 250A alternator upgrade and a 1/0 wiring kit. I have been experiencing "cut out" or "overload" mostly for the sub and sometimes the tweeters. Lots of troubleshooting and a little google searching led me to the idea my VOLTAGE was DROPPING. Naawww, not with my BIG ALTERNATOR! Surely not. Turns out, YEAH! Still feeling unsure about a cap purchase, I saw this Belva BB2D for only $40 bucks. Wired it in and VUAL LA. My system is Pa Poundin'. It Works!The techy stuff. Pioneer DEH 80 PRS head unit, JL Audio HD750/1, JL Audio HD 600/4, JL Audio 300/4v3, JL Audio 12W6v3-D4 subwoofer, Focal 165FX in front, Boston Acoustics SX60 in back. 600/4 feeds mid-woofers and 300/4 feeds tweeters. All crossover/ slopes/ levels/ eq are set up in the Pioneer head unit. I removed one of the the 3rd row seats in an suv and made a platform to mount my amps, covered it with a board and made a custom, sealed, 1.0cu ft sub box that fits over the "arm rest"/ rear wheel well. All 4 mids and the front tweeters are custom fit into stock locations. The rear tweeters are visible.Buy this and get rockin'!

Works great. And as intended 10/10

I absolutely love it so far but I have not tried to charge it yet because I am not quite ready to install everything. Maybe tomorrow I will try again.but for what I paid.i can't complain. Update I have installed it and yes it works great I have no issue with my headlights dimming at all. I have 2 amps running one 4000 watts and 1600 watt amp it's great. I highly recommend buying one. just my opinion though. You need to make sure it's big enough for your system.

It works. I do not have a super powerful amplifier. But when it hits this capacitor helps level out the energy drain.Looking back on this purchase I decided I should have purchased a capacitor with a larger capacitance.

It’s a pretty good capacitor for how cheap it is. Gets the job done and has a decent digital display.

I knew I needed one going into my subwoofer install. The car had stock subs with about a 80 watt amp. With the stock 8 ohm subs, the voltage was fine with the high amp alternator I put in years ago. I tried 2 ohm subs on the stock amp, just to see. It didn't burn out the old stock amp, so that was nice, but it really dragged the system voltage down to about 13, volume depending. I put in a 600 watt rms amp and sub combo with this capacitor and the voltage holds pretty steady at 14+ regardless of how much I want to damage my hearing. Perfect.And the resistor worked fine to charge up the cap. It probably took a couple minutes, but did what it was supposed to. The cap didn't appear to respond for several seconds, so have a little patience with it.

There are actual capacitors that really do work, but a lot of them on this site are basically just voltage meters honestly, I had less voltage whenever I installed it. I did everything right I hooked it up, followed the instructions but at the high bass spots it dipped way below what just two batteries did. I just installed a beefy alternator to fix the problem and now my system‘s fine I would just recommend you get a bigger alternator instead of wasting your time and money on these cheap capacitors

Back in the day, these were expensive. Now, they are cheap. The fact it has an led voltage display is a bonus. Great deal for $35 bucks. I used it to compensate for the 8 guage wire i ran to 2 powered subs. (120w each rms). Might be everkill, but i like it.NOTE: be sure to use the included resiser to power this up the first time, slows the charge time. Takes awhile to charge. Also keep this resister if you have to remove it and discharge it.