I wanted to get a 12 since they weigh about 7 pounds less than the 15 and they are less bulkier. I bought a 15 last night since they did not have a 12 in stock. The 15 sounded really good but I kind of would love to have the lighter smaller 12. What am I giving up if I go to the 12? Loss of some low end maybe? They are both 500 watt amps but since that is the max they are probably more like 250 watts. I would think the 12 could hold up against an average volume drummer?