Hey all, I’m new to this forum. Are there Marshall aficianados here? I had a bass cab with 2x10 1x15 cabinet with some sort of circuitry inside the cab. I heptbthe 15” speaker and I have some 10s from a guitar amp and was thinking about putting the speakers in some old drum shells. Just wondering if anyone knows what this is and if I need to include in my project. Also if anyone knows of a wiring diagram for this amp. It’s a model 7125 cab.