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which capacitors for my KEF Calindas

 
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centaurus
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Joined: 21 Apr 2006
Posts: 125
Location: Okland, CA

PostPosted: Wed Apr 11, 2007 11:47 pm    Post subject: which capacitors for my KEF Calindas Reply with quote

well, it's looking like my Calindas are going to be my main speakers of choice. coupled with my REL Q100 sub, they are awesome.

I've heard that KEF used electrolytics throughout the crossovers. is this right? if so, being 30 year old electrolytics are pretty leaky by now. would some decent polypropylenes be in order?

nothing stupid fancy. thinking solen or jantzen. there was some talk that the public calinda crossover schematic wasn't right. do we have a correct one?

thanks,
Robby
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JimN
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Joined: 19 Dec 2005
Posts: 8
Location: London, England

PostPosted: Thu Apr 12, 2007 12:39 am    Post subject: which capacitors for my KEF Calindas Reply with quote

http://www.hifiloudspeakers.info/Anatomy/Crossovers/Calinda/CalindaCrossoverIndex.html


If you move the 5uf cap in the LF section to the right of L2 (i.e. across the B200 input) and reverse the phase of the T27 you will have the correct schematic. The cap values are correct.

Good luck,
Jim
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ColinR
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Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Thu Apr 12, 2007 7:44 pm    Post subject: Reply with quote

Quote:
If you move the 5uf cap in the LF section to the right of L2 (i.e. across the B200 input) and reverse the phase of the T27 you will have the correct schematic


If those members who have copies of original KEF schematics, waterfall and phase plots had contributed copies to this site.
I wouldn't have spent £30 on a "ex-display" Meterman LCR55 and spent about eight weeks desoldering capacitors, measuring inductors and trying to work out some logical solutions.

The schematic is the way it is for a reason. So who's going to stick their head above the parapet and compare and contrast phase and waterfall plots between the 104aB, Calinda, etc?


Solens are a good choice for older KEFs, but you don't need to go overboard with the larger values. One made up of 20% solen and 80% electrolytic will give you the same effect as 100% Solen which above 20uF are just too big to hang of a KEF pcb.
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JimN
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Joined: 19 Dec 2005
Posts: 8
Location: London, England

PostPosted: Fri Apr 13, 2007 12:09 am    Post subject: Reply with quote

Well, I don't have any original KEF schematics, but I do have a pair of original Calinda crossovers (SP 1055) in front of me and after double-checking I can only confirm that the layout is different to that shown on this site. The T27 is in phase with the B200 and the 5uF capacitor is wired across the B200 (not between the notch filter and L2).

Quote:
The schematic is the way it is for a reason.

It may well be that the site schematic layout offers an improvement over the original - I suppose it's up to the individual to try it and decide.

Regards,
JimN
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