SD Acoustics SD 5 crossover diagram & loudspeaker types

Is there anybody who could help with information about SD Acoustics SD 5:
crossover circuit diagrams?
which loudspeaker types are built in?
better loudspeaker / successors?
mechanics, esp. how to remove the cross over PCB?

I would like to renew my old but loved loudspeakers.
Thank you in advance,
BerndK