I play in a loud classic rock band with a horn section. A good 1x15 could cover any gig I've done quite easily even without PA support. Even a not so good amp, like my Fender 250 watt 1x15 combo works just fine, and has more than enough volume, although the tone isn't as good. Heck, there's an old 100 watt Fender 1x15 at our rehearsal space and sometimes I use that just for fun. It's enough.
This of course assumes that your band knows something about sound. If you have guys that are just in it for themselves and just "turn up" all bets are off. You could have the biggest rig in the world and it wouldn't be enough. All my comments assume some knowledge of how to EQ yourself and a band.
I ended up with a 600 watt class D head into a 4ohm 2x12 (older Genz Benz). It's WAY more than I need.
This of course assumes that your band knows something about sound. If you have guys that are just in it for themselves and just "turn up" all bets are off. You could have the biggest rig in the world and it wouldn't be enough. All my comments assume some knowledge of how to EQ yourself and a band.
I ended up with a 600 watt class D head into a 4ohm 2x12 (older Genz Benz). It's WAY more than I need.