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Old 18th June 2012, 05:38 AM   #11
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The B139 only has a 3mm xmas. It was used in t-lines by many and could only play so loud. It was beter suited to a closed box. with aperiodic damping. The B110 should have been used in t-lines to flatten out the peaks. The Audax 5' bextrene had a faltter response and never received the publicity of the B110.
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Old 18th June 2012, 06:02 AM   #12
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You never see the Audax 10" HD24B45 bextrenes mentioned which had a 3mm xmas just like the B139. The sensitivity at 1000hz was rated at 92.5db. It could play significantly louder then the B139 at 30hz in a t-line.
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Old 18th June 2012, 08:44 AM   #13
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id buy the B110s and T27s myself if theyre the 15 ohm woofers.
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Old 19th June 2012, 01:59 AM   #14
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Reading this thread with interest as my first decent speakers when I was a teenager were a pair of Concerto's. Bought them not long after becoming an apprentice. At that time I thought they were wonderful. I eventually made a pair of LS3/5a clones out of them as the house I was living in at that time didn't have room for the Concerto cabs. The B139's sat on a shelf for many years. After many years of listening to more recent designs it has become apparent that more modern drivers are so much better. The KEF's had so much Xover intervention to account for the bad behavior of the drivers that it literally strangled them in my view. Yes they had relatively flat responses but at what cost. Having said that I still have a soft spot for them. They were very good for their time and the R & D done by the engineers at KEF was quite ground breaking back then. My opinion would be to sell the drivers to someone who is restoring a pair of Concerto's or LS3/5a's or the like.
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Old 19th June 2012, 02:23 AM   #15
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Quote:
Originally Posted by mondogenerator View Post
id buy the B110s and T27s myself if theyre the 15 ohm woofers.
IB there never was a 15 ohm B110. The 15 ohm LS3/5A used 8 ohm B110.

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Old 19th June 2012, 02:55 AM   #16
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Kef and the BBC working together complimented each other and was good publicity for Kef.. One reason why so many people were into the Kef drivers.
Back in those days many of the pioneers in loudspeaker design knew each other.
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Old 19th June 2012, 04:32 AM   #17
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ok dave, i stand corrected. But you know what i mean, 15 ohm version of LS3s, SP1022? Cant recall.
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Old 19th June 2012, 05:30 AM   #18
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LS3/5A used selected B110 SP1003.

SP1022 was B200 variation.

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Old 19th June 2012, 11:12 AM   #19
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The B110 came in two versions. The SP1003 and the SP1057 (I think). They had slightly different characteristics and LS3/5a's using them had crossover variations to suit. Original BBC LS3/5a's were apparently individually adjusted to compensate for driver variations. It would seem that consistency between batches was a problem back then.
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Old 19th June 2012, 11:24 AM   #20
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I happen to have ONE B139 woofer should anyone have a use for it!
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