Hi all. I came across 2 of the BSS mcs200 active crossovers recently when I did a buyout of one of the theatres that closed doors. I bought a fair bit for f their equipment which was mainly speakers. Martin Audio horn stacks. The 2 crossovers have slightly different board configurations. I know the one unit, configured for Martin, crosses at 250hz,1,5khz. I can’t find much on the net on these units other than pics. Wanting to find out if anyone perhaps has access to a old service manual. Would also like to know if anyone has modified and changed the crossover points at all. Is this even possible. My boards are the 201,202,203,204,210 as far as I remember. Any input would be greatly appreciated.