I have found that not all sound is good sound for the ears, even at a given sound pressure. Distortion is the key. Even moderate levels are fatiguing if the sound is crap. If the tweeter/amp etc. is straining then your hearing is getting destroyed. There is, of course, the consequences of hearing damage at high sound pressures, no matter the 'quality'. At this point in my life, I want to enjoy my hobbie, if that means some hearing loss, so be it. I use my cost benefit algorithm in my head to determine the 'right' volume at a given time/song etc. I'm not too vain to get a hearing aid in the future if i need one.
Eric
Emotiva XPA-2, Magnepan MMG (mod), Quickie (mod), JRiver, Wyrd4sound uLink, Schiit Gungnir, JPS Digital power cord, MIT power cord, JPS Labs ultraconductor wire throughout, HSU sub. powered by Crown.