I'd guess the overpowering sound was due to distortion when the drivers were pushed outside their normal range. It's an interesting problem to have. I've found it's distortion that hurts the ears. I can crank my ATCs up really high but because they're made to play very loudly without distortion it doesn't create the discomfort just about any other speaker would. 115db continuous is loud!
http://atcloudspeakers.co.uk/professional/loudspeakers/scm110asl-pro/
http://atcloudspeakers.co.uk/professional/loudspeakers/scm110asl-pro/