HEI has been involved at NAMM, AES and other conventions, where mass quantities of "professionals" are attending. In a recent report, forwarded to me by my brother, the smug doctor, I learned that the hearing loss occurs significantly in the following order: 1. DJs 2. Musicians 3. Monitor Sound Engineers 4. Live Sound Engineers 5. Recording Engineers Females have better conductive hearing than males a majority of the time. DJs most always loose a majority of the top end of their range, due to the constanct exposure in clubs, shows, etc. Monitor engineers HAVE to listen to mixes all of the time, where as FOH guys can manage their exposure time better and use use protection more often. Most musicians over 40 have MAJOR loss! So, all of these over 40 guitar players, drummers, etc that want to get tweaky about the sound of 9V batteries, cables, drum stick wood, etc are mostly full of crap, in denial, and putting on an act. But, we knew this anyway did we not? Come on. Anyway. While in the trenches, manage your exposure time to sound. If you have to mix or play a gig, subtract that time and average dB SPL from your normal everyday activities. Conserve it. I do this quite alot, and it is amazing how my mixes do not bite like some "old road dogs" touring around. I can still hear up to 17kHz at 38 years of age, and my threshold is still quite good. Get your hearing checked annually. If you notice that you are always grabbing for the EQ on certain freqs, and you are using different gear often, or the same gear in different venues, then you ought to know why. Later.