I need to do something about the crossovers in my vintage Celef PE1 / II speakers. (3 drivers: KEF SP1039 / Audax HD13D34 tweeters and a Motorola KSN1036A Piezoelectric unit supertweeter, crossing over at 250 Hz and 5,000 Hz or so I have read). When I was young I routinely (stupidly) overdrove them (ending up in popped speaker units of course) and as a result the crossovers often overheated and eventually burned up the traces on the crossovers . They were a long time ago re-capped, but its time to sort them out properly now.
(Background - I have found on the web that following a change of name In 1979 Celef became ProAc and Stewart Tyler, as Chairman with sole responsibility for design at ProAc, utilised the same drivers in a slightly different configuration to become ProAc 3's)
I have been on to Falcon Acoustics in the UK who manufacture replacement crossover boards but they don't know the model type I need, and the damaged boards are nigh on impossible to identify regarding type.
Does anyone know the board number of have a photo of an original to help me identify them?
I will of course recap them etc, and I am also trying to decide whether to use the original inductance coils (ferrite I believe) or replace them with new air cored parts. What is the sonic benefit of air over ferrite?