Here you can see the Sub-woofer (there are 2 of them).
The driver is the Shiva 12" by Adire Audio. The
cabinet is 88.5 litres and they are powered by 2 KG-5230 Sub
Amps from Madisound.
Kiega KG5230 Subwoofer Amp with Electronic Crossover (300 Watts)
This is one of the crossovers for the satellite speakers. They are the part of the ME-2 designed by Lynn Olsen