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R103.2 crossover question

 
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RKV1
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Joined: 07 Sep 2010
Posts: 7
Location: Washington State

PostPosted: Sat Jan 07, 2017 7:12 am    Post subject: R103.2 crossover question Reply with quote

The schematic shown in the "Technical" section for the crossover for a R103.2 SP1144 shows a 1.8 mH inductor in the LCR section of the feed to the B200. If I measure the same inductor in my R103.2's, it measures 1.1 mH. The second inductor, nearest the B200, measures 1.8 mH. I believe the schematic shown is in error and the LCR inductor should be 1.1 mH and the second inductor should be 1.8 mH. Has anyone else measured these two inductors in the their R103.2"s?
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil

PostPosted: Sat Jan 07, 2017 10:01 am    Post subject: Reply with quote

Sorry I don't have any 103|2's. Have you emailed the contributor?
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RKV1
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Location: Washington State

PostPosted: Sat Jan 07, 2017 7:49 pm    Post subject: Reply with quote

No, the original posting was 13 years ago. The schematic for the Carlton III SP2026 looks to be virtually identical to the R103.2. That schematic was taken from a factory blueprint and shows the larger inductor closest to the B200. I believe that's the correct arrangement of the two inductors.
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SteveB
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Joined: 31 Dec 2003
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PostPosted: Sat Jan 07, 2017 7:52 pm    Post subject: R103.2 Crossover Reply with quote

After thirteen years, I have opened up my KEF 103.2 and checked the inductor values:

You are correct, the inductor values should be as you say; 1.1mH in the LCR section and 1.8mH going to the bass driver.

The schematic drawing is therefore incorrect, with the inductor values the wrong way round. Oops.
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RKV1
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Location: Washington State

PostPosted: Sat Jan 07, 2017 7:58 pm    Post subject: Reply with quote

Thanks Steve for double checking.
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil

PostPosted: Mon Jan 09, 2017 10:22 am    Post subject: Re: R103.2 Crossover Reply with quote

SteveB wrote:
After thirteen years, I have opened up my KEF 103.2 and checked the inductor values....


Once a KEF enthusiast, always a KEF enthusiast!

Cheers Steve
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SteveB
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Joined: 31 Dec 2003
Posts: 11

PostPosted: Sun Jan 15, 2017 11:52 pm    Post subject: R103.2 Crossover Reply with quote

So true: still a KEF enthusiast.

I don't post that often (!) but still take an active interest. At this rate, I'll be 68 when the next query comes in!

regards,
Steve.
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