So before roasting me over a fire please hear me out. And my disclaimer is that I already know what I would do, but here goes. My church has a theater where we put on concerts, etc. and we have two live bands, one metal group and the other is country. The metal band is the headlining act so our rigs (bass stack and two full guitar stacks) are set for their sound. When the country group goes on, they sound like a rock band (not undesirable IMO but YMMV). My friend, the country band's guitar player and main sound man wants to use his tube amps for both full stacks and switch between the metal band's amps and his when we both play on the same nights. He claims that many pros do this. I understand the risks of blowing up tube heads and don't want to do this (the metal band's amps belong to the church and aren't cheap). My preference would be to run our Marshall cabs in stereo and power one side of each top and bottom with one head, run two more mikes up to the FOH system, and we'll only have to turn them up a bit to compensate for any loss in volume. The 12's will act like a line array so that will help, and we won't have the complexity and inherent risks of switches failing, blowing up amps, etc. Thoughts or suggestions?