Identify 18" PD driver from Axys B-89

DE-250/25/24 are very ok drop ins.

DE-500 too, but there’s no need to use a more beefy driver than DE-250/25/24.

There’s indeed little info on the web. Back in those days everything was on paper only and these systems were not so widespread in use outside Holland and Belgium. I have my info from the original designers/manufacturers with whom I worked close with right after the split to Duran/Axys and Soundprojects/Master Blaster. Lots of paperwork/info got “lost” during that time ( it wasn’t an amicabel split to say the least...). All this is another story for another time maybe, but I’m mentioning it now, because it has to do with all alterations that exist of that Source Set (B89/T86) you have and also a number of other types that existed back than and were in some form or another produced and marketed different by both companies for some time just before, during and after that troubled split.

Depending on manufacturing date of your cabs, you can have products of either company and that means also possibly different electronics. Not entirely different, but things like crossover sits in what cab to name one thing. I kinda forgot about it, because Soundprojects always had all dedicated crossover/processing in each cab and xlr in/out was simple hardwired, but your question jolted my memory back. Full Axys versions had indeed possibilities to couple thing around in a few ways and there was something like one xlr input and two or three xlr outputs. One hardwired in to out, another with low out or something. There was also this thing with symmetrical and electronically buffered asymmetrical outs, that was a pain sometimes to get buzz free. The notorious DO-3 power connectors were also part of that problem by the way. So you might be right that your set has crossover for the B89 in the T86 only and nothing crossover sits in the B89. The 300Hz crosspoint is the only certain thing than ;-).