So I've got a Fender Bandmaster head and a peavey classic 30 head. One runs at 4 ohms, 1 runs at 16 ohms. Right now I'm looking at buying a 112 that runs at 8 ohms. Could I put a switch in this cabinet that could switch between 4 and 16 ohms? If I have to replace the speaker to do this that would be fine.