Went to see Grandmaster Flash at "Under the Bridge" (more of a live music venue normally) in Fulham last week. Old school hip hop might not be everyone's cup of tea but it was excellent and the sound system they have there is unbelievable. It was phenomenally loud but without any discernible distortion and no ear ringing afterwards. I've never felt bass that strong before that was also so textured and rhythmic. All apparently due to Abramovich spending £20M on the venue.
http://underthebridge.co.uk/whats-on/
http://underthebridge.co.uk/whats-on/