I’ve been to many great & loud concerts since 1972 but I saw & sort of heard the New Riders of the Purple Sage w/ Jerry Garcia joining in at the Academy of Music in NYC in 1975. We weren’t even sitting close & in the mezzanine pretty far back but it was crazy loud to the point where I could barely tell who I was listening to!
strange thing is back then there was no “array” systems w/ DSP & class D amps so popular today, just big stacks of Marshall’s & Fenders but dam was it loud!
I pity those who were close to the stage. Strangely, I saw Jerry & the Dead back then several times & it was loud but very clear & enjoyable.