Has anyone devised a good, solid test for the a/c current supply when you're setting up for a gig? I have had several places lately that have had poor power for my Mackie 1400i power amp. The last gig I did was an outdoor private party at a residence and it was an ordeal to find sufficient power. I borrowed a 1000watt theater-type light and hooked it into a Tripplite 20amp line conditioner that had a stack of LEDs indicating the "level" of current being used. It worked well, showing me the differences between 20amp and 15amp outlets 'after' the extension cord run, but lugging around this contraption is tough. What I was hoping to find (like the ESP Projects site) was a specific tester that would allow me to load test the a/c current supply available to the amp prior to sound check.