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Old 6th February 2006, 12:39   #16
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OT: Generalneo, is ur HU turbo-charged???
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Old 6th February 2006, 13:48   #17
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Hey Navin and Sam,

Thanks for the clarification.
I was just wondering if audio caps were just regular electrical caps with the audio branding yknow.
Kinda like, am i paying Rs100 for bisleri in an evian bottle ?

cya
R
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Old 6th February 2006, 14:30   #18
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Quote:
Originally Posted by Rehaan
Hey Navin and Sam,

Thanks for the clarification.
I was just wondering if audio caps were just regular electrical caps with the audio branding yknow.
Kinda like, am i paying Rs100 for bisleri in an evian bottle ?

cya
R
No, your not paying for the branding. You would not be able to buy for example a 1 farad capacitor in the market.
The max you might get is 22000 mfd.
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Old 6th February 2006, 15:02   #19
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Like Sam says. 22,000mfd/450V is about as big as you can expect to get with regularity (450V is kinda large, for a car 50V or 63V is adequate).

A 1F or 0.5F stiffening cap is built for only one purpose. Sam had about 4 in the now defunct eyeballer. I assume that the new eyeballer 2 (swift) might be even even more over the top.
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Old 7th February 2006, 15:10   #20
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And if you go to any ordinary electronics parts store and ask for 1F caps, they will laugh at you. Partly because most of the shopkeepers have no idea about such stuff.

Sam, how is the Swift project coming along? And what happened to the Santro?
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Old 7th February 2006, 16:54   #21
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Santro? WHat Santro?
The swift project has taken a back seat for 2 weeks. I'm focussing on the nationwide JBL multimedia launch.
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Old 7th February 2006, 17:02   #22
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I am talking about the black Santro JBL had for the vaahan yatra in bangalore.
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Old 7th February 2006, 18:31   #23
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Oh that! lol
I'm getting old. Yeah, no changes on that one yet. It's rocking.
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Old 7th February 2006, 19:09   #24
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hey guys i have a jbl cs 300.1 amp and jbl gto1200b sub
do u think i shoud put a cap????
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Old 9th February 2006, 12:33   #25
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madhukesh, are you facing any problems. if it ain't broken dont fix it.
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Old 21st February 2006, 03:18   #26
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I've got a Pio 305F powered by a sony 502, and a 305C powered by a pio 6000F. Pio 6990 rear 6x9s are also powered by the 6000F. Do i need a cap??
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Old 21st February 2006, 07:03   #27
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can some1 tell me if i require a capacitor..
Pioneer P1-Y Head Unit
(1)Prosound 800w amp for my JBL comps + AudioBahn Ovals
(2)Prosound 800w amp for my AudioBahn Special Edition Sub
Twister 300w amp for my Twister Sub

Do u guys recommend a capacitor if so how many farads etc.. thnx..

~cheers
-ASH
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Old 21st February 2006, 10:08   #28
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Geez. Guys. If it aint broken dont fix it. Just becuase you got a solution dont go looking for a problem.

Let me set some thumb rules here. JB/Gun/Sam etc will add ot it I'm sure.

Caps are usually used where bass transients cause the power supply of the amp to pant. In a car the car battery is part of the power supply of the amp.

Now why does an amp pant?
We all know P=VI and V=RI.
a) Too low an R and with V being constant I has to go up.
b) When I goes up and V is constant P goes up too.

Most amps are voltage amps where the voltage is amplified and controlled. So a 100W amp is really a really putting 20V at 4 ohms. at 2 ohms it still puts 20V but really is putting out 200W (current goes up from 5A to 10A).

Now the power supply cannot keep up indefinietely with this increased current draw and starts running out of steam much like a long distance runner and hence the panting analogy.

So what does the capacitor do to solve this.
Lets look at another equation.
Q = C V. where Q is the energy stored in a cap. C is it's capacitance and V is the voltage.

When you add a cap to a power supply it stores energy and when the power supply runs out of steam it releases this energy.

Q: So all amps should benefit from this capacitor?
A: Not nesscarily.

An amp's output devices have a limit to the ammout of current they can safely dissipate. So after a while if the current drawn exceeds the ammount of current an amp can dissipate pop goes the output device or a safety circuit (if it exists).

Now adding a capacitor to a amp can help or not or on a very rare occasion can even damage the amp (if the amp's design stipulates that it's power supply is being used to regulate the output stage).

What's all this gotta do with Bass? A-ha.

Bass requires more energy than middle and upper frequencies. Traditional Music has an energy spectrum where about 50% of it's energy is below 300Hz and the other 50% above it. In fact less than 8-10% of musical energy is above 5000 Hz. So it usually bass notes that exhaust the amp (and/or it's power supply).

Lesson: If the bass peaks are clean let the amps be.

You guys seem to have found a hammer and are now everything looks like a nail!

P.S. This is the abridged version. Longer explantions are found on audio forums.

Last edited by navin : 21st February 2006 at 10:09.
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Old 21st February 2006, 11:22   #29
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nice explanation navin! thnx 4 that.. but im not sure yet whether i should go in for a capacitor or not..they're pretty expensive..earthquake the basic model costs arnd 4.5-5k

~cheers
-Ash
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Old 21st February 2006, 12:04   #30
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Listen to your music. it'll tell you if you need a cap or not.
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