Here in the US, it would be next to impossible at best to gain access to a 480 Volt feeder to power these amplifiers. It would need to be arranged (and paid for) well in advance of a show. And that's IF the venue has a 480 Volt system-which very few do. A venue such as Madison Square Garden MAY have a 480 system for lighting and motors but the usual setup is a pair of 600 Amp 120/208 fused safety switches at stage right for the vendors to tie into.
If you really wanted to use this amplifier to it's rating in the US, you'd need to carry a delta/delta transformer to step up 208 Volts to 480 Volts.
Having done this, you'd then need to convince the venue staff it's an approved appliance. I do NOT see any level of safety compliance approvals on the unit or noted in the users guide. At minimum, larger venues (read: Unionized staffing) will inspect unfamiliar gear and look for at least a CE certification. Without it, you won't be allowed to apply power to it. AND, say some catastrophic failure occurred. Insurance adjusters will inspect the gear. Guess what they'll do when the gear has no safety certifications or approvals?
Having said all this, I would love to see this amplifier in person. After all, I'm half Hungarian!
