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Multi-Way Conventional loudspeakers with crossovers

KEF crossover help
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Old 9th September 2011, 01:40 PM   #11
eanee is offline eanee  Australia
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Hi metako,
Yes I think the KEF 104aB high pass section, being set at a reference level of approx 85dB, would be just fine for the B139/B110/T27 setup.
The 18dB high pass slope is pretty important to avoid exciting the rather high fundamental resonance of the T27-1.5kHz or thereabouts IIRC.

Hi googlyone,
It's interesting to read a little of the history of the BBC LS3/5a.
Apparently the various licensed manufacturers had real problems trying to ensure their production remained within BBC specs due to the variability of the raw drivers,especially the B110 SP1003 version.I recall Martin Colloms testing the LS3/5a in Hi Fi Choice and finding a huge 6dB peak at 1.2kHz.Late in the day KEF introduced the improved B110 SP1228 version along with calibrated matching crossovers to solve this variability problem.
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Old 9th September 2011, 05:44 PM   #12
speaker dave is offline speaker dave  United States
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The woofer response suffered from an elevated midrange. If I remember right it was mostly due to the rubber surround supplier. The material just wasn't the same as it had been years earlier.

(One of my projects in 1984?, I think.)

David S.
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Old 10th September 2011, 01:00 AM   #13
metako is offline metako  Australia
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Great, thanks Eanee. Does anyone know where I can get FRD and ZMA files for the B139/B110/T27? (I know these can be made, I'm just being lazy!)
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