SIX 20kW class-A amplifiers?
So somewhere between 120 and 250kW static heat dissipation?
A very large room is going to be a pizza oven, a large auditorium will bring it down to sauna levels. Perhaps the electricity bills will be reassuringly expensive?
On a milder note, I spotted this guy reviewing some ATC speakers. Some of what he says seems reasonable. But he has a thing about ferromagnetic materials in connectors or mere PVC insulation on wires. He'd almost earned a bit of credibility before that.
https://www.youtube.com/watch?v=irdIUAcA7MU
David