Hearing Loss is no joke. It is not uncommon for house and techno events to play music at dangerous levels. There are a number of veteran DJs who have suffered hearing loss, both from years of exposure and a number of isolated incidents. Examples include Lil Louis, Larry Levan, and Paul Oakenfold.
8 hour exposure at 85dB is enough to cause hearing damage. For every 3 dBs over 85dB, the permissible exposure time before possible damage can occur is significantly reduced. At 120 dB damage is done immediately. Read more