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KEF 104/2 Crossover with Ceramic Capacitor

 
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we5004
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Joined: 01 Mar 2014
Posts: 8

PostPosted: Mon Mar 09, 2015 10:53 pm    Post subject: KEF 104/2 Crossover with Ceramic Capacitor Reply with quote

Hi, can anyone explain. I have a matched pair of SP2050 crossovers (consecutive S/Nos.). However, on one of them two parallel celectrolytic capacitors have been joined together at one end before they pass into the pcb, with a small disc ceramic capacitor - then the other end of the ceramic capacitor is soldered onto the pcb. Clearly, where one of the electrolytics should be soldered onto the pcb there is now a vacant hole with solder to the rear of it where the capacitor was attached at one time. I thought ceramic capacitorsv were a no no in crossovers? Thanks for any help. Peter
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil

PostPosted: Mon Mar 09, 2015 11:31 pm    Post subject: Re: KEF 104/2 Crossover with Ceramic Capacitor Reply with quote

we5004 wrote:
...on one of them two parallel electrolytic capacitors have been joined together at one end before they pass into the pcb, with a small disc ceramic capacitor - then the other end of the ceramic capacitor is soldered onto the pcb...

Shocked Someone has been messing around.
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MartinW
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Joined: 12 Jun 2011
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PostPosted: Tue Mar 10, 2015 7:36 pm    Post subject: Reply with quote

Hi Peter, are you sure it's a ceramic capacitor and not a polyswitch to protect the tweeter? Does it look anything like this:
http://www.audiokarma.org/forums/showpost.php?p=6893393&postcount=150

Martin
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speakerguru
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PostPosted: Wed Mar 11, 2015 9:55 am    Post subject: Reply with quote

MartinW wrote:
...are you sure it's a ceramic capacitor and not a polyswitch to protect the tweeter...

Good thinking. That would be much more likely than a ceramic capacitor.
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MartinW
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Joined: 12 Jun 2011
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PostPosted: Wed Mar 11, 2015 12:17 pm    Post subject: Reply with quote

speakerguru wrote:
Good thinking.


It wasn't my good thinking, unfortunately. On the thread I linked to someone else suggested what this "capacitor" really was.

I wonder whether one of the OP's polyswitches failed (to high resistance) and was removed to get the tweeter working again?
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