My understanding (at least a friend told me this) is that one requires at least 50 watts to overpower a drumset. And so I have a 65 watt amp, and in my garage that works out extremely well as I don't have to go past 2 on the volume and my drummer is drumming pretty loudly. However, does anyone know if this is loud enough for performances in, say, a gymnasium (a high-school gymnasium for example) or for even an outdoor performance? (I'm not even certain of the conditions outdoors yet, but May 30th I'm supposed to play with some friends downtown, and it's outdoors I believe).

Any opinions or advice would be appreciated, thanks.