Huge capacitors

coldcut · 31st October 2011, 08:34 PM

Hi! Some of you has probably seen these beasts already:

300uF Capacitors, 25 kg each, 1 KM of metalfoil. Price? I dont dare to make a guess.. I know that a pair of 6.8 uF caps in the same series cost +4000 USD.

Apparently these were a specil order for a xo application of some kind.

But is it really a good idea to put 1 Km of metalfoil in series with your speakerwire? Or , how are these to be used, you think?

454Casull · 31st October 2011, 08:43 PM

Maybe they are air dielectric.

tomtt · 08:58 PM

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how well do they pick up RF?

chrisb · 31st October 2011, 09:14 PM

tomtt - you may have seen this one too, sworn by a Sitka Alaska Dentist, Dr. Richard Kraft to be true;

coldcut · 31st October 2011, 09:31 PM

So... from your pictures, I draw the conclusion that they are suitable as anchors.. While studying wildlife..

Erlend Sæterdal · 31st October 2011, 09:53 PM

My topsystem ( midrange and tweeter ) are for upgrading new midrange . I am afraid it will be a hard job to bring them up to my apartment . 100 uf. cast in each ! Do anybody else have them for impedance correction on the midrange upwards ?

chrisb · 31st October 2011, 10:08 PM

Quote:

Originally Posted by coldcut

So... from your pictures, I draw the conclusion that they are suitable as anchors.. While studying wildlife..

no, the only conclusion safe to draw from the above 2 posts would be

........squirrel!

in other words, some of us have short attention spans, and are very easily distracted

Erlend Sæterdal · 1st November 2011, 12:30 AM

Quote:

Originally Posted by coldcut

Hi! Some of you has probably seen these beasts already:

300uF Capacitors, 25 kg each, 1 KM of metalfoil. Price? I dont dare to make a guess.. I know that a pair of 6.8 uF caps in the same series cost +4000 USD.

Apparently these were a specil order for a xo application of some kind.

But is it really a good idea to put 1 Km of metalfoil in series with your speakerwire? Or , how are these to be used, you think?

You do not know much about caps my friend. The foil is not in series with signal.

coldcut · 1st November 2011, 08:37 AM

Well, you need to run a electric signal through the foil to build up a charge in the dielectric material, in this case probably impregnated paper. I don't know about you, but I always put my crossover parts in the signal path.

If this is fundamentally wrong, enlighten me! I'm no expert, hence the question:

Quote:

"how are these to be used, you think?

Luke · 1st November 2011, 08:40 AM

these should be banned, I could build a car with that much metal

31st October 2011, 08:34 PM	#1
coldcut diyAudio Member Join Date: Aug 2008	Huge capacitors Hi! Some of you has probably seen these beasts already: 300uF Capacitors, 25 kg each, 1 KM of metalfoil. Price? I dont dare to make a guess.. I know that a pair of 6.8 uF caps in the same series cost +4000 USD. Apparently these were a specil order for a xo application of some kind. But is it really a good idea to put 1 Km of metalfoil in series with your speakerwire? Or , how are these to be used, you think?

31st October 2011, 08:43 PM	#2
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Maybe they are air dielectric. __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

31st October 2011, 08:54 PM	#3
tomtt diyAudio Member Join Date: Aug 2002 Location: kansas city mo, and on occasion, around the world ... Blog Entries: 15	`````````````````````````````````````````````````` ``````````````````````````````` how well do they pick up RF? Last edited by tomtt; 31st October 2011 at 08:58 PM. Reason: 43

31st October 2011, 09:14 PM	#4
chrisb diyAudio Member Join Date: Aug 2002 Location: victoria BC	dat's a close call tomtt - you may have seen this one too, sworn by a Sitka Alaska Dentist, Dr. Richard Kraft to be true; __________________ you don't really believe everything you think, do you? community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi

1st November 2011, 08:40 AM	#10
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	these should be banned, I could build a car with that much metal __________________ If you give a man a fish he will eat for a day. But if you teach a man to fish he will buy an ugly hat. And if you talk about fish to a starving man then you are a consultant. Dilbert


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31st October 2011, 09:31 PM	#5
coldcut diyAudio Member Join Date: Aug 2008	So... from your pictures, I draw the conclusion that they are suitable as anchors.. While studying wildlife..

31st October 2011, 09:53 PM	#6
Erlend Sæterdal diyAudio Member Join Date: Mar 2007	My topsystem ( midrange and tweeter ) are for upgrading new midrange . I am afraid it will be a hard job to bring them up to my apartment . 100 uf. cast in each ! Do anybody else have them for impedance correction on the midrange upwards ?

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