Louis_Niebur
Ex Member
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Hello Richard, and all,
(I am an intruder on this site, and probably shouldn't be here either!) I just wanted to expand slightly on what Mike said...
There is a bit on the LSU/10 in Edward Pawley's book, BBC ENGINEERING 1922-1972 from 1972. He says it is based on a Parmeko model, and, like Mike noted, that its response fell off above 7000Hz. The biggest problem with this was that it made it impossible to hear the 10125Hz buzz that sometimes appeared from a 405-line television signal, and would end up in radio and television programmes! By adding the Lorenz tweeter, this was fixed.
The Lorenz tweeter (ok, we're getting pretty nerdy here!) was the LP-65 model, and some advertising I found for it says it is "Clean, Clear, and Crisp up to 16,000 cycles!). It used 2 watts, impedance, 5.5 ohms and was 2 1/2 inches in diameter.
I assume (although I am not an engineer) that you would need the HP-1 Kingdom High Pass Filter to go with the Tweeter, since it enables clean movement between the frequencies of the woofer and tweeter...
Hope this helps! Louis
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