@ Pedroleao;i don't know man really...as you can see there was a wall of Marshall's so big as Maestro said,THAt and the chinese wall are 2 things you can see from space........haha. No seriously;i really wouldn't know,i flew to London just to see him,there was no mention of any type of amp in that hall that day,just 25 minutes of pure viking power and when he walked off the lights went on and everybody scattered to the exits...very surreal because i was in sort of a trance even while filming it