Well, originals aren't common, as you can gather by my fruitless search! Visaton do a current model called the MHT12 which I suspect might be a suitable replacement with minimal tweakery but last time I checked they were about £160 each.
The crossovers themselves are now back as they should be once more. The previous owner upgraded some components but in the course of re-assembling, managed to put the positive tweeter wire in the wrong place, turning the high pass filter into a low pass one! I managed to get hold of the original crossover schematics and rectified this, and the one working speaker sounds very nice.
Too many speakers? Tell me about it!
Last edited by Beobloke; 20-06-2014 at 15:43.
Engineers: fixing problems you didn't know you had in ways you don't understand.