Think what you like about the Grateful Dead, but they had some of the finest sound systems that I have heard. Sometimes I wished that they were louder but then realized that they were playing with sufficient volume but the sound was so clean that it did not seem as loud as it was. Following the Radio City Music Hall shows in 1980 their engineer, Dan Healy, mentioned in an interview that the sound system they used for those shows was 'capable of human damage' and yet I thought those shows could have been louder. When the sound is nice and clean it can be played plenty loud and it just sounds.....perfect.