Hello ,what is the proper way to use the mono/stereo switch on a marshall 1960 vintage 4x12 straight cabinet where the 2 plugs in the back say 1960b 4x12 150c/ch. stereo warning !do not switch to mono with stereo input i currently have a marshall jcm 800 100 watt 2210 plugged into a marshall 4x12 avt412 8 ohms 200w rms angled cabinet . but i'm looking at a marshall 1960 vintage 4x12 straight cab ,and would like to know how to use just one and possibly both cabinets together in a stack . right now i have head and cab both set to 8 ohms . but need to know the proper settings when bringing in the 1960 vintage to use either separate or together ,thanks .