My band has a 1000W PA, a 300W Monitor Amp, a 300W Bass amp, a 100W Guitar Amp, and several other peripherals like delays and reverb units that pull about 100W each.
But yet with ALL our devices plugged in and my trusty fluke meter measuring current, I see about 8 amps peak... This is with the signal on the board peaking...and loud enough to split atoms through resonance.
Another question (unrelated)... would speaker cable that is too small (16 gauge)cause an amp (300W per channel)and two woofers (300W each)to blow? This was in a 100' snake, so voltage drop and resistance may come into play here. (8 ohm speakers).