Does any company make a Switchable Ohmage Cab? You know make cab that you can switch from 8 to 4 ohms or 4 to 2 ohms. That would be soooo nice in terms of flexibility. For instance if you have a 1200 switchable cab, and head that puts out 1200 at 2 ohms. Well instead of two four ohm 1200 cabs you would only need to flick a switch to two ohms and keep your cab weight down. Any such thing like this or am I just dreaming.