SpeakerTalk

RKV1 · Posted: Sat Jan 07, 2017 7:12 am Post subject: R103.2 crossover question

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?

speakerguru · Posted: Sat Jan 07, 2017 10:01 am Post subject:

Sorry I don't have any 103|2's. Have you emailed the contributor?

RKV1 · Posted: Sat Jan 07, 2017 7:49 pm Post subject:

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.

SteveB · Junior Contributor 10+ Joined: 31 Dec 2003 Posts: 11

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.

RKV1 · Posted: Sat Jan 07, 2017 7:58 pm Post subject:

Thanks Steve for double checking.

speakerguru · Posted: Mon Jan 09, 2017 10:22 am Post subject: Re: R103.2 Crossover

SteveB · Junior Contributor 10+ Joined: 31 Dec 2003 Posts: 11

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.