"Bob Latham" wrote in message
...
In article ,
tony sayer wrote:
That C.J. Rogers design used a Cambridge Audio R50 crossover.
If you
used A B139/B110/T27 with a 250w amp at a *party* rather than
a tea
dance you would have melted the voice coils.

Friend of mine had some large free-standing KEF's for that
application
no end of times they went off for repair..

We used to run a rather upmarket market disco with a couple of
Tannoy
Yorks driven by a water cooled QUAD 303 -.

Loud and oh so clean;.

I did but KEF was happy to effect a repair at a very
reasonable price.
Probably better to use a digital crossover and multi-channel
power amps
these days. One of those Behringer jobs with 4th order L-R
and
adjustable delay?

I wonder how much of a problem ferrite saturation really is?
Any test results on the internet?

Have to say that the above does paint a slightly unfair picture
of KEF
speakers. I am of an age when as a young man many (if not most)
of my work
colleagues aspired to own KEF loudspeakers. Of all of them I
can only
recall one person who had blown a KEF drive unit in his R104s
(T27)
because a plug/socket had become partially disconnected (DIN if
I recall
correctly).

A system with B139/B110/T27 probably had a recommended max
amplifier
rating of around 150Watts. Using an amplifier of considerably
more power
and then using that for a party constitutes no small amount of
abuse IMHO.


[snip]

I had that kit - with the addition of a pair of Coles super
tweeters - in the TL design by Dr Arthur Bailey published by WW
in 1972.

IMSMC they were rated 50Wrms system.


--
Woody

harrogate three at ntlworld dot com