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best KEF speaker with B139?

 
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hans 67
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PostPosted: Thu Jan 12, 2006 8:54 pm    Post subject: best KEF speaker with B139? Reply with quote

Hello all,

what do you think is the best KEF speaker with the B139?
And why?

I can think of the folllowing candidates:
-Concerto
-Cantata
-C80
-CS7

I have choosen to name only the 3-way designs.

Hans
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qguy
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PostPosted: Fri Jan 13, 2006 12:19 am    Post subject: Reply with quote

to add...I think one of the Sonus Faber models has a B139
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hans 67
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PostPosted: Fri Jan 13, 2006 9:30 pm    Post subject: Reply with quote

qguy wrote:
to add...I think one of the Sonus Faber models has a B139

OK, I did not know. But I did mean KEF speakers. Maybe interesting for another topic which speakers we all know with the B139.

Hans
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hans 67
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PostPosted: Fri Jan 13, 2006 9:34 pm    Post subject: Reply with quote

Let me start.

Tweeters.
All 4 have different tweeters:
Concerto: T27
Cantata: T52B
CS7: T33A
C80: T33B

What is the best tweeter?

I myself do not like the T52B. I think it is more a upper midrange than a tweeter. I have had a Cantata. To less highs. Only in the Cantata? I have only heard this tweeter in the Cantata, so I can not commend on this tweeter in other speakers, better mariage?

Hans
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ColinR
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PostPosted: Fri Jan 13, 2006 11:00 pm    Post subject: Reply with quote

Like speakers in general; with tweeters it all depends upon "what floats your boat" are you into Canticles or Thrash Metal?

In the Concerto you can move from a simple Bessel, through a corrected Bessel to an acoustic Butterworth or Zobel filter for the T27.

The T52 can be found with similar filters, which depress the rising upper frequency output with varying degrees.

The T33A is regarded as a spitty soft dome, so the aB filter designs are usually preferred over those with a Bessel filter.

The T33mkII uses variations on a steep sloped Zobel.

At the last count I had 34 pairs of different B139B, B200A, B200G B110A, B110B, T27, T52, T33A & BD139B based designs.

As there are four KEF research designs within the terms of reference of my collection (including the time-aligned CS7 and a multi-bass line array) and eight other "kit designs" plus two other CS9/Ref 105-2 variants that I haven't heard, the PL301 and the Skyline, I don't feel qualified to comment.
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proffski
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PostPosted: Fri Jan 13, 2006 11:50 pm    Post subject: Reply with quote

An early Sonus Faber Bookshelf model did indeed use the KEF B139 ABR unit on the back of the cabinet.
qguy wrote:
to add...I think one of the Sonus Faber models has a B139
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hans 67
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PostPosted: Sat Jan 14, 2006 8:41 am    Post subject: Reply with quote

Thank you ColinR,

that is very informative.
If I understand you correctly than you are writing that the sound of the tweeters is very depended of the filter in front of it?

My problem with the T52B is too less highs. Not on axis, but off axis. that makes the room power at higher frequencies less. I am afraid that this can only be "repaired" by letting the T52B ramp up at higher frequencies. And I think that I do not like that. I have a problem with the T52Bs small dispersion. that is why I sold my Cantatas.

Hans
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ColinR
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PostPosted: Sat Jan 14, 2006 10:29 am    Post subject: Reply with quote

Quote:
the sound of the tweeters is very depended of the filter in front of it


Very much so.


Quote:
is too less highs. Not on axis, but off axis


That's why Cantatas are usually found with the steel mesh grills removed to assist the dispersion pattern.
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hans 67
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PostPosted: Mon Jun 05, 2006 3:34 pm    Post subject: Reply with quote

Update:

I now have some Concerto's repaired. I bought them with failing crossovers. Last weekend I bought some 2nd hand crossovers and now the Concerto's are singing. I like them very much.

My preference on KEF speakers with B139 is:

1: Concerto (now playing)
2: C80 (in storage)
3: Cantata (sold to friend)
4: CS7 (never heard)

Hans
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proffski
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PostPosted: Tue Apr 21, 2009 9:50 pm    Post subject: Reply with quote

proffski wrote:
An early Sonus Faber Bookshelf model did indeed use the KEF B139 ABR unit on the back of the cabinet.
qguy wrote:
to add...I think one of the Sonus Faber models has a B139


In fact it was a B139 with a coil, the characteristics were altered by switching different value resistors across it.
I do not know if it was an off the shelf B139 or specialy made for Sonus Faber. lATER THEY WENT ON TO USE A DRIVER FROM TDL.
It was the "Sonus Faber Extrema"

http://audiofederation.com/blog/archives/27

http://forums.dearhoney.idv.tw/viewtopic.php?f=14&t=40939&p=344274

An excellent design review of the loudspeaker incorporating the KEF B139 driver and a five resistors! http://www.stereophile.com/standloudspeakers/915/
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ColinR
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PostPosted: Wed Apr 22, 2009 8:50 am    Post subject: Reply with quote

Quote:
what do you think is the best KEF speaker with the B139


I think the question should be what do you think is the best speaker with KEF drive units?


Currently I would say any speaker likely to be stripped of it's drive units for profit so nobody else can enjoy it .
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