@bmarlowe unfortunately true re hearing, HH level is very subjective.
I used to play drums in a band with a bass guitarist using a Stereo Rickenbacker through a 100w with 2, 4 x12's orange rig on my left and a Marshall 100w with 2, 4x12's rig on my right, the ears can suffer. Fortunately for me the band had a decent mixer and I used headphones.