I played a show tonight using my AI Clarus head. Not the first time I have, but I tried an experiment with the cabs this time. I plugged in both my Tech 2x12 and the Acme B-1. The Tech is 8 ohms, the Acme 4. Also the Tech is a good deal more efficient than the Acme. I realized the Acme would get twice the power but still not be as loud - however I felt it had the lows and and a better top end to help out with, if even just a little. So, first I should say that adding the Acme made almost no noticeable difference. So, the experiment was useful in that regard. However, the Clarus cut out a few times during the show. The total load was 2.67 ohms, but it's rated down to 2. I suppose I was pushing it pretty hard, but it's hard not to push the Clarus it seems (I was playing with a moderately loud drummer and a guitarist pushing a baritone through a 4x10 cab). It would stop making sound for about a second, and it did this four or five times. After I unplugged the Acme it stopped. Tomorrow I will plug in the Acme to make sure it didn't get fried (and maybe short out) but hopefully that's not it and I just ran into the Clarus' tolerance limit. I don't know if it got too hot or what (it wasn't hot to the touch). Anyway. I really like having this tiny little amp, but I think there's a QSC PLX in my future.