Never mind, Mesa called me back, their 2x12s are 16 ohm celestions wired in parallel. *Breaking that for stereo means two 16 ohm loads run out of 8
ohm speaker outs, which is safe, but less efficient causing the amp to work harder to drive the speakers...which is usually a good thing. *They mentioned that I could possibly also see a reduction in the highs, but maybe not. *We'll see...
If anyone has done this mod, let me know what you think about it.