Hard to say which concert was the loudest. There was an Emerson Lake & Palmer concert that actually hurt all the while I was there. A Yes concert at the Bowl that had me covering my ears (I was about 2/3 back from the stage) and a Rage Against the Machine concert at the Universal Ampitheater that literally shook the whole place (the upper seating was moving so much and I could feel my heartbeat change its pace to match the beat...scary).
A result of all this is I have a rather faint case of tinnitus that's comes and goes but it's so faint that I can tune it out at will and/or ignore it. Writing this made me aware of it again. No more concerts for me as anything louder than what I listen to at my place instantly hurts. If I had my druthers....
All the best,
Nonoise