Hey guys I've been doing some research on an idea I had. Basically want to sit a box between my guitar amp head (tube amp) and my 4x12 speaker cabinet (75w rms, 16 ohm speakers) that will let me select any combination of 1 to 4 speakers without blowing up my amp. Started reading about stereo selector switches and that is basically what I'm trying to do. However, I can't really find any that don't let everything dip below 8 ohms. Do you know what the circuitry inside one of these things looks like or how I may mod/build one to suit my application? Thanks!