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I have a system in my car my sub is 2000 rms i have it hooked up to an 800 watt amp and in about a week i'm buying a 1800 watt amp my question is should i get a capacitor or should i already be running one? oh and if i need it how many would i need? :bigsmile:
 

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I would get a capacitor mimimum 3 farads. I have 3 farad, running 700rms in all on both my 12'', and 1550w RMS amplifier. Sound is crystal clear and don't notice any lights dimming. You should def run a capacitor when you get your new amp. One is sufficient. It will be much better on your battery, and you'll notice a difference in big bass hits.
 

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I would get a capacitor mimimum 3 farads. I have 3 farad, running 700rms in all on both my 12'', and 1550w RMS amplifier. Sound is crystal clear and don't notice any lights dimming. You should def run a capacitor when you get your new amp. One is sufficient. It will be much better on your battery, and you'll notice a difference in big bass hits.
Thanks sooo much for your help!
 

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capacitors.... did jack shit for me.

Waste of money in my opinion, i would do this
1) buy a optima yellow top battery
2) upgraded alternator
3) capacitor

You will get the least amount of effect out of the capacitor. If you think about how a cap works.

It takes a charge from the battery and holds it until it is needed. SO itll take all the power then release it once the sub hits then it will drain just as much juice from the battery to refill itself. So i guess a capactior would work for the first hit of the sub but then after that the cap is pulling the same amount of juice from the battery as the sub would.
 

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a cap is just a bandaid... if your gonna be running 1800rms you need an extra battery.
 

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capacitors.... did jack shit for me.

Waste of money in my opinion, i would do this
1) buy a optima yellow top battery
2) upgraded alternator
3) capacitor

You will get the least amount of effect out of the capacitor. If you think about how a cap works.

It takes a charge from the battery and holds it until it is needed. SO itll take all the power then release it once the sub hits then it will drain just as much juice from the battery to refill itself. So i guess a capactior would work for the first hit of the sub but then after that the cap is pulling the same amount of juice from the battery as the sub would.
I knew someone would bring this up. and wrong, caps don't do shit. If you have a really high rms wattage system, then you should be running BOTH a cap and a bigger/second battery. Running the system off just a battery is BAD because the battery, no matter which one you upgrade to, is not made to discharge really fast according to how much power the subs need. The capacitor is DESIGNED to slowly take energy from the battery and STORE that energy so that when the bass hits, the subs have ALL the energy they need and it is readily available, and they are not degrading your battery's life. For a small system, like less than 2000rms and you don't always crank it, a good sized capacitor will do. If you are running over 2000rms or if you have 1500rms and always blasting your music, then upgrade the battery or add a second one AND get a good sized capacitor.

Just because your amp is 1800rms does not mean it is using the 1800rms. If your sub is less, then the max power that will be used is what the sub is taking from the amp, and that's at max volume too.
 

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I knew someone would bring this up. and wrong, caps don't do shit. If you have a really high rms wattage system, then you should be running BOTH a cap and a bigger/second battery. Running the system off just a battery is BAD because the battery, no matter which one you upgrade to, is not made to discharge really fast according to how much power the subs need. The capacitor is DESIGNED to slowly take energy from the battery and STORE that energy so that when the bass hits, the subs have ALL the energy they need and it is readily available, and they are not degrading your battery's life. For a small system, like less than 2000rms and you don't always crank it, a good sized capacitor will do. If you are running over 2000rms or if you have 1500rms and always blasting your music, then upgrade the battery or add a second one AND get a good sized capacitor.

Just because your amp is 1800rms does not mean it is using the 1800rms. If your sub is less, then the max power that will be used is what the sub is taking from the amp, and that's at max volume too.
i understand the cap is designed to slowly take energy from the battery, but when the sub hits eery 1-2 seconds how can it slowly take it from the battery.

I have a 1 farad cap and a 1000watt amp with an L7. YOu can see even when the volume is low and the sub is not even hitting that hard the lights still dim. i turn it up a little bit more, lights dim dramticlly more.

So how do these caps work then?
'
My buddy had a 5farad stinger cap in his corolla. It did jack shit for him too and he had 2 sony xplodes running 750 rms.....
 

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^Capacitors, by definition, take energy at a constant rate from the battery, and store it. Tha capacitor stays full all the time, and when needed, the amp will take the energy it needs from the cap, be it 0.5 farads or 1 farad, or as much as the subs need to hit the heavy bass. If you or your friend didn't notice a difference, it's because you don't have your music cranked enough or you simply don't need that much power for your system.

1 farad of electrical energy is enough to kill a person. So 5 farads is more than enough to give a big system all the power it needs when it's cranked to the max and hits a really hard bass line. Batteries are not made to be drained really fast in order to give the amp the power it needs for the subs. So it won't give as much power at once to the amp. I think maybe you don't notice the difference because you are looking in the wrong places. The cap should make your high bass hits louder and stronger, and protect your battery's long term life. Also, most capacitors will allow your system to not drain your battery out completely, which I find is also really useful (some turn off before the battery dies etc.)
 

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oh and by the way, sony explodes are not exactly high-quality subs. I doubt the subs were pulling much energy out of the amp to begin with. Amps should all also have very limited internal capacitors, but nowhere near what a seperate cap can deliver. Your firend's system prolly didn't change much cuz the system was not demanding alot to begin with.
 

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even watching my cap, I can tell you that the rate at which it takes energy from the battery is constant. It's also proportional to the rate at which it distributes energy to the amp. It's like an average instead of instantaneous energy loss, and much better for the battery. Unless your bass hits super fast, like 5 times a second, then it's fine.
 

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Discussion Starter #11
my sub is 2000 rms right now i have a horrible amp and i'm getting about 800 from it i listen to it really loud like all the time so i'm pretty sure just with the bad amp its bad for my battery and when i upgrade i will b listening to it rlly loud too haha so my best bet would be the extra battery and the capacitor?

heres a old vid of my sub Ive upgraded the HU to a pioneer premier i have the ipod running through the glove box it's hooked up to the usb so it charges an all that good stuff lol i just dont wanna be driving down the street one day and my battery just gives out and i'm stranded haha


 
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