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Old 8th January 2014, 04:01 PM   #1
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Default Blown crossover cap - can't find direct replacement

Sorry for busting in here with a noob post like this, but I'm hoping you guys can help me out here. I've popped a cap in one of my crossovers from my Infinity IL50 towers, and I cannot find a direct replacement:

Brand: Elytone
Type: Aluminum Electrolytic Radial
Capacitance: 2.4uf
Voltage: 100v
Tolerance +/- 10%

I'm not looking to improve performance beyond OEM, but the problem is still that I cannot find a 2.4uf aluminum electrolytic cap anywhere in any voltage at all. Mouser, digikey, google, etc all turned up either 2.2uf or 2.7uf. Is going to a 2.2uf or 2.7uf cap going to audibly change the way the speakers sound? I understand I will also likely need to recap that other channel for consistency's sake, and that's fine. This is the C4 cap in the attached schematic.
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Old 8th January 2014, 04:21 PM   #2
kevinkr is offline kevinkr  United States
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Parallel a 2.2uF capacitor with a 0.22uF cap and that should be close enough. Film capacitors may be fine for this location.
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Old 8th January 2014, 04:27 PM   #3
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2 x 4.7uF back to back would be close enough too.
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Old 8th January 2014, 06:09 PM   #4
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Quote:
Originally Posted by kevinkr View Post
Parallel a 2.2uF capacitor with a 0.22uF cap and that should be close enough. Film capacitors may be fine for this location.
I considered running two in parallel, but the caps are radials and pcb mounted. If I ran two axials shoved in the holes, would the additional length of the leads present any more resistance to cause an audible difference? I attached a couple pics of the crossover network for reference.

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Originally Posted by KatieandDad
2 x 4.7uF back to back would be close enough too.
By back to back you mean in series with one reverse in polarity right? I'm guessing that halves the capacitance of one of them? Still faced with the packaging issues though.
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File Type: jpg IMG_20140108_121040[1].jpg (519.0 KB, 64 views)
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Old 8th January 2014, 06:19 PM   #5
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Originally Posted by airtower View Post
If I ran two axials shoved in the holes, would the additional length of the leads present any more resistance to cause an audible difference?
It would be the equivalent of adding an inch of speaker wire- no audible difference (unless you can hear that type of difference).
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Old 8th January 2014, 06:24 PM   #6
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Ok, I got all my questions answered. Now time to get to fixin! Thank you all so much!
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Old 8th January 2014, 06:25 PM   #7
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Why did the cap "pop?"
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Old 8th January 2014, 06:44 PM   #8
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Why did the cap "pop?"
An overly boisterous 30th birthday party

But seriously, these speakers have a lot of hard hours on them. The party I think just broke the camel's back. I picked them up second hand 10 years ago and had them through college so they were cranked, often. The caps didn't leak, but the top is certainly bulged and it's come up off the pcb.
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Old 8th January 2014, 06:45 PM   #9
Lojzek is offline Lojzek  Croatia
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airtower,

your original cap had a tolerance of +/-10%, that is 2,16
to 2,64 uF. It is just a matter of positioning the new one.
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Old 8th January 2014, 06:54 PM   #10
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Just out of curiosity, what effect on the filtering does pushing the capacitance one way or the other do? These are three way speakers, so I'm sure they're designed with adequate overlap.
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