I am receiving the Glasstone today, and I already own the F112 (8 Ohm). I'm not really expecting these to cabs to be in competition, but I got such a great deal on the 212 that I couldn't pass it up. I'm expecting the 212 to be louder (4 Ohm), but will it really be TWICE as loud? I have a gig tomorrow night. I might bring both cabs to AB. Also I'm running a Genzler MG800 that is stable down to 2.6777 Ohms. Can I run both cabs safely? I would think so.