That's a hard one to decide, in the 70's I have been to plenty of gigs where my ears were ringing long time afterwards. There was one gig where I was positioned in front of stage of Hammersmith Odeon on the right side (facing the stage) Deep Purple concert and I had the full blast of RB speakers. In those times it was good to be familiar with the songs, because I sure hell could not recognise them at the time of concert, it was all so loud and I could only hear part of the instruments. During the playing a lot of times I had to work out the song they were playing.... The film 'Spinal Tap' really hit it spot on what it was like with Rock bands and when he said 'look the volume knob goes up to 11..!' that really reflected the attitude of many 'Rock' bands in the 70's.