Hi guys,
I am replacing the 17-year old electrolytic capacitors in the crossovers of my Infinity Kappa 7 speakers.
These capacitors are rated at 100V.
Will it be ok if I were to use 63V or 50V capacitors as their replacement?
I am thinking of using Elna Silmics as replacements. 100uF Solens are too big and too expensive for me right now.
Appreciate your help. Thanks.
I am replacing the 17-year old electrolytic capacitors in the crossovers of my Infinity Kappa 7 speakers.
These capacitors are rated at 100V.
Will it be ok if I were to use 63V or 50V capacitors as their replacement?
I am thinking of using Elna Silmics as replacements. 100uF Solens are too big and too expensive for me right now.
Appreciate your help. Thanks.
What's the impedance of the speakers and what's the power level you're playing with?
It would be way better to use 100V caps. You can make a 100V cap by using 4 of the 50V caps in series-parallel.
It would be way better to use 100V caps. You can make a 100V cap by using 4 of the 50V caps in series-parallel.
Thanks.
The impedence is between 4 to 6 ohms.
How do you go about getting a 100V out of 50V caps?
Do you connect - + + - ?
The impedence is between 4 to 6 ohms.
How do you go about getting a 100V out of 50V caps?
Do you connect - + + - ?
Let say you have a 100uf 100V cap.
With two 100uf 50V caps, - + + - will give you a 50uf 100V cap.
Then you parallel that with another pair to get back at 100uf.
What is the maximum power you plan to use with these speakers?
With two 100uf 50V caps, - + + - will give you a 50uf 100V cap.
Then you parallel that with another pair to get back at 100uf.
What is the maximum power you plan to use with these speakers?
you can use 63v 100mf capasitors.it is not problem with hi-fi amplifiers.But be careful about polarity.
You are better off giving the eletrolytics the flick and using metallised polypopylene and even the ones cheaper than the Solens would be better than the original.
Sorry to resurrect a thread from the mummies, but Google led me here... I have a pair of Infinity Q3 with dual voice coil Watkins. I am therefore thinking of replacing four 600uF caps that are connected in series with chokes and the woofer coils. I like to play loud, and I now have the Hypex nc500 amp from diyaudio user Boggit. It can peak at about half a kilowatt. These speakers can dip to 2 Ohms, as the voice coils are paralleled. I can see no voltage rating on the old caps. They are original (circa 1978).... What do I replace them with?
If you must go with electrolytic stick with bipolar. Bypass with 1-5% in a film cap. Bennix, Axon or cornel dubilier are good low cost bypass caps for this. Axon is low cost Solen rebrand
At 600uF times four, yes anything but electrolytics will be excessively expensive, and I anyway gather that the quality of woofer caps isn't all that critical. Would you agree?
The bypass is interesting. Do you mean to parallel the bipolar electrolytic cap with a film cap of something like 10 or 22 uF? And why is that good?
The bypass is interesting. Do you mean to parallel the bipolar electrolytic cap with a film cap of something like 10 or 22 uF? And why is that good?
No, the real question that matters is how much voltage can you send
to speakers without destroying these?
You think bypassing with smaller caps makes sense? Can you bypass
a VW Beetle with a Porsche sticker and say that it's now a sports car?
to speakers without destroying these?
You think bypassing with smaller caps makes sense? Can you bypass
a VW Beetle with a Porsche sticker and say that it's now a sports car?
You may look at this article it has a little bit about why a bypass cap is sometimes a good idea. http://waltjung.org/PDFs/Picking_Capacitors_1.pdf
Just for the heck of it I looked at Walmart online. I know NOTHING about these but they do look interesting and rather cheap !
Metallized Polypropylene Film 600uF AC 250V Motor Starting Capacitor - Walmart.com
Metallized Polypropylene Film 600uF AC 250V Motor Starting Capacitor - Walmart.com
You might consider that if you use a high voltage cap, the most likely failure point is then the driver. Caps are cheap, drivers are not.
Bypassing a woofer cap is harmless but doesn't have much actual function.
Bypassing a woofer cap is harmless but doesn't have much actual function.
Amazing how people don't do simple homework.
Infinity Quantum Serie
I'd lose the 600uF in the Infinity QLS 3 altogether. They hardly do anything. Kappa 7 schematic follows.
Quite alarming 2 ohm impedance from the dual-voicecoil woofer. You wonder why separate filters were used on each voice-coil, which must sum to something simpler. Who designs this stuff? LOL
Infinity Quantum Serie
I'd lose the 600uF in the Infinity QLS 3 altogether. They hardly do anything. Kappa 7 schematic follows.
Quite alarming 2 ohm impedance from the dual-voicecoil woofer. You wonder why separate filters were used on each voice-coil, which must sum to something simpler. Who designs this stuff? LOL
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half a kilowatt into 4ohms is roughly 63Vpk. Allowing for a worst case output voltage peak of 70Vpk then I'd suggest the absolute lowest voltage bi-polar or non polar capacitor you can use is 80V. But I suspect you can more easily source 100V bi-polars, if you need them at all !
It's gotta be 100V Non-polars in a speaker that goes so loud.
I usually go by the power rails on the amp. A 20W pc amp has a +/- 30V power supply. Assuming you don't have high-Q resonant LCR circuits which multiply voltage.
A more powerful amp can output much higher voltages.
I usually go by the power rails on the amp. A 20W pc amp has a +/- 30V power supply. Assuming you don't have high-Q resonant LCR circuits which multiply voltage.
A more powerful amp can output much higher voltages.
100V, 600uF plastic film (MKT) will be mighty big and mighty expensive if one cannot locate a special offer.
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