Alright here's the deal, i am just starting a band with my boys ( 1 or 2 guitarists and a drummer). I need a new amp (right now i only have a 20 watt drive combo ) and I need enough power to be heard above the guitarist(s) and drummer. We play rock music that is preety heavy but nothing extreme. The guitarist has a 100 watt tube amp. The drummer is preety loud. I have been doing research for quite a while have decided to go the pre/power amp route. The best balance of price and quality i came up with is a Sansamp RBI preamp, a QSC RMX 850 poweramp, and a Avatar B212 cabinet. The dilema i have is how many ohms on the cab. If i get a 2 ohm cab can i run it in "half" stereo since the QSC can't handle 2 ohms bridged?