The suit claims Harmon, who was sitting in the second row, suffered "severe acoustic trauma" and permanent damage to his right ear because the sound system was set up negligently at the band's April 2, 1999 concert.
Also named as defendants are three Knoxville companies: promoter A.C. Entertainment Inc., the venue Historical Tennessee Theatre Foundation and the sound company M&L Sound Inc.
A call to the band's publicist was not immediately returned Wednesday.