In article ,
Serge Auckland wrote:
Only a small amount of information:- The LSU/10 used a Tannoy 15" driver
and Lorentz tweeter driven by a 12 watt amplifier. They were in use in
1962, but I have no idea when they entered service or were replaced.
This brief description and a picture can be found on

No - the originals had Parmeko dual concentric drivers. I think they date
from about the early '50s. The tweeter was added after FM started and some
home listeners were hearing things you couldn't on the LSU/10 which I
think cut off at about 10kHz which was fine for AM radio then. The amps
were either Leak or SoundSales. Cabinets were made by Lockwood who later
moved on from just being cabinet makers to produce their own designs for
recording studios, etc.

With the need for higher SPL for pop music sessions some were modified to
Tannoy units.

--
*Some people are only alive because it is illegal to kill.

Dave Plowman London SW
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