So I just bought an interesting 60's ex BBC RG Jones PA Column thinking it might make an interesting power soaked bright box for the studio. I haven't got it yet but I am intrigued to find out why it has two 3 pin female XLR's and one male 3 pin. So that 2 ins and one out?!. I know its going to be easy to trace the wiring once its here but why three XLR's, what's up with that. As far as I remember seeing one its just full of those little speakers they used to put in AKG Auratones (Horrortones) Any Ex BBC wallah's care to chip as to why this is so!