Without a doubt, YES at Duke Indoor in 1972. Worse, I moved to FL after graduation that year and saw them again at the old SPORTATORIUM in Hollywood, FL. I had to do the same thing I did at Duke--I went to the furthest seat available at the very rear of the place and it was STILL hurting my ears.
I had just left our band, which itself was loud after playing for years in various bands at high volume standing in front of amps. I personally had a SUNN Scepter, which was no shrinking violet itself.
THANKFULLY, in spite of attending MANY concerts over the years--the first was Ray Charles at the DOME in Virginia Beach in 1962--my hearing seems to be just fine. Selling high-end audio beginning in 1974 helped me develop a more discerning ear. I consider myself LUCKY based on my past exposure to very loud music for many years.
I confess, I still crank up the volume on the Maggies for some songs--Dicky and Duane's back-to-back guitar solos on "Stormy Monday" Live at the Fillmore East, Heart's version of the great Nillson tune "Without You" on Magazine, Felder and Walsh guitar solo on "Hotel California," Eagles version of the Charles Brown tune "Please Come Home for Christmas," and many others. Since Maggies don't cause in "listening fatigue," it is a pleasure to crank them up sometimes.
Cheers!