It just depends on the type of music you play and the tone you're going for. If we were playing country or blues, I'm sure the AC15 would have enough juice to get me though. But, when you're running a distortion pedal into an already overdriven amp, it's easy to get lost in the mix. To put it more plainly: if you're playing with distortion, you need to be louder than your clean signal. It's hard to do this with the AC15 in some situations. It's a headroom issue, not a volume issue.