You can clearly see she doesn't have anything plugged into the 2nd amp, and it's not even powered on (the power light is off!). I'd be surprised if the 2nd cab in the stack that's actually being used was even plugged in - considering there's no mic, neither might be plugged in and she might just be going DI'd to the board.
I do actually play in a stupid loud band. We just happen to keep stage volume reasonable. I can talk to anyone on the stage in a normal voice and be heard. IEMs + good PA = no need for loud stage volume, at all.
Additionally, I used to play an SVT. At times, an Ampeg V4BH too. I now play a pre/power setup that potentially hits 900W RMS. I never had an issue being heard in any of the three cases. Cabs used were either 4x10 Avatar or a crappy SWR 2x10 at the studio. Our practice volume is extremely high (I wear earplugs, of course).
Why you have to grill me about this, I don't know. But, there's your answer. If your band can't keep reasonable stage volume, then yeah, you're going to have issues. Your issues are going to be more than just being heard, though, too - your band probably sounds like crap out front.
I do actually play in a stupid loud band. We just happen to keep stage volume reasonable. I can talk to anyone on the stage in a normal voice and be heard. IEMs + good PA = no need for loud stage volume, at all.
Additionally, I used to play an SVT. At times, an Ampeg V4BH too. I now play a pre/power setup that potentially hits 900W RMS. I never had an issue being heard in any of the three cases. Cabs used were either 4x10 Avatar or a crappy SWR 2x10 at the studio. Our practice volume is extremely high (I wear earplugs, of course).
Why you have to grill me about this, I don't know. But, there's your answer. If your band can't keep reasonable stage volume, then yeah, you're going to have issues. Your issues are going to be more than just being heard, though, too - your band probably sounds like crap out front.

