That's a tough call. Two would be great. Those Bergs are strong.
With my current gig, I could get by with one 12 onstage since we have excellent PA support and great monitors. With that said, I just like having two onstage. I can get a great tone with plenty of volume without pushing my rig.
You could probably get by with one if you have good monitors, but I would set my goal for two eventually. Just my opinion.
Well Quackhead, you beat me with your last post. If you have a good PA with good monitors, I would go for it. However, I still like having a second 12 just in case.
P Bass, Jazz, Thunderfunk TFB750-A & 550B, Aggie 3xGS112, Thunderfunk Club #35