got the amp, love it through my mesa 2x12 at 8 ohms. I am concerned that there is no 16 ohm selection switch. I have Marshall 4x12's which are 16 ohm cabs. I've read many times that going from 8 ohm amp to 16 ohm cab, while safe, will result in less volume and punch which is unacceptable to me especially being in a metal band. Every amp I've owned, which has been over a dozen, has had an option for 4,8, or 16. Why did mesa cheap out on this? Should I consider returning the amp because I am not willing to part with my 16 ohm Marshall cabs? PS. As a disclaimer, I realize it was my lack of research that led to me buying the amp before realizing this. As I mentioned, every amp I've ever owned has had a 16 ohm selection on back, so I didn't even think to wonder about this on an $1,800 amp.