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Hi, got a 1 farad capacitor rockford fisgate punch from my friend. I am wondering if it is better to sell it or install it. I'm running a very simple setup 4 gauge wire to an 800w pioneer amp to a jl audio sub. Would I notice any increase in performance? If not ill just sell it.

I am also going for sq not spl.

Edited by nicholas.ivanov

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Hi, got a 1 farad capacitor rockford fisgate punch from my friend. I am wondering if it is better to sell it or install it. I'm running a very simple setup 4 gauge wire to an 800w pioneer amp to a jl audio sub. Would I notice any increase in performance? If not ill just sell it.

I am also going for sq not spl.

It should help. I know I'll probably get slapped for this if its wrong, but I've always heard that you should have about 1 farad per 1000W of power. I'm currently running a small setup myself. have a 1000W Kenwood amp going to two Kicker C124's and I run a 1farad RF cap. It cleared up my headlight dimming in no time flat :)

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Heres there 100 farad cap cap

Thanks for the explanation. I always wondered what caps actually did. I have a 4 farad cap and I always wondered why the RF one was more than mine I payed $90 for mine

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What size cap would I need? I'm running a RF P1000 and Alpine PDX 4.100. I have a cap I paid $90 for it's "4 farad" but it's not working for me. Could it be because I'm only running 4 gauge on each amp?

You really didn't give me much information to go off of . . .

- Your amps are obviously unregulated as they can produce more power with higher input voltage . . . maybe T3ks?

- What topology are they? (Class D?, bd?, A/B?) OR, what are their efficiency ratings?

- How much current at 14.4 volts are you paying Dom for?

Some simple math with your 3,000 watt Class D example at 14.4 VDC on sine waves would be:

3,000 / .75 = 4,000 watts Input required x 2 = 8,000 watts input

8,000 / 14.4 = 555 amps of current

Let's say your amps require 17 feet of power wire between them and the batteries and another 5 foot between them and the frame (chassis won't cut it here) for their grounds. To get 555 amps of current to your amps at 14.4 VDC, you'd need:

Big Wire:

- 1/0 AWG wire has .0001 ohms resistance per foot - 22 foot of it will have .0022 ohms of total resistance

- 555 amps through 22 foot of 1/0 . . . 555 x .0022 = 1.22 Volts drop in the cable alone

- 4 runs of 1/0 AWG . . . 555 x .00055 = .30 Volts drop in the wire - mo' better

BEEFY Alts:

- 300 amps at 14.7 volts . . . remember, we lost 3 tenths of a volt in our four runs of 1/0 AWG . . .

- 2 required

Now, if we add batteries, these need 7 to 10 amps of current each to allow charge to flow into them . . . I'm not seeing the benefit with the car running. But, if you wanted to jam this system with the key off then you'd need 'em for sure. Look at the AH rating on the battery you're shopping for. On music, these two amps would require roughly half of the current they require on sines . . . let's say these batteries had a 65 AH rating.

555 / 2 = 277.5 Amps

277.5 Amps / 65 AH = 4.3

So, you'd need 4 to 5 batteries to play this system wide open on music for ONE hour. After one hour, nominal battery voltage would be somewhere around 10.5 to 11 VDC.

And . . . these 4 batteries would require 40 amps of current to allow them to be charged with the vehicle running . . . better get Dom to up those alts to 350 amp models . . .

Ain't nuthin' free . . . Incidentally, this is a case where capacitance just can't cut it. The amount of capacitance a system this size would require would make it cost prohibitive, but if you could swing it, two of our 100 Farad caps of old would certainly help.

Now - where you're getting 16 volts DC you'll have to share . . .

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Whats the sizes on all the RF Caps they make Biggest to smallest?And How much does the Biggest one run?NOT msrp but bought @ a autherized dealer?

I have a 10 farad RF RFC10HB capacitor for sale for $200.00 shipped. The retail is $499.00. Hit me up.

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I have a 10 farad RF RFC10HB capacitor for sale for $200.00 shipped. The retail is $499.00. Hit me up.

LOL this thread is older than dirt but why we are at it I have a Lightning Audio/Rockford Fosgate CPCC1 50 Farad cap for sale and yes the way I used it, it was great and yes I know my shit.

I want $250 local or $285 shipped.

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Well I am really just like.......uh......uh huh.......

I think i am going to put that 5 Farad back in my truck before i put the L7's in.......

When I was only running 1k rms I used a RF 10 farad hybrid cap. Very beneficial when you only need to maintain a higher/steadier voltage. I like this thread :)

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