Stol......."acquired" from Wikipedia.
Prevention
Tinnitus and hearing loss can be permanent conditions. If a ringing in the ears is audible following lengthy exposure to a source of loud noise, such as a music concert or an industrial workplace, it means lasting damage may have already occurred.
Prolonged exposure to sound or noise levels as low as 70 dB can result in damage to hearing (see noise health effects). For musicians and DJs, special musicians' earplugs play an important role in preventing tinnitus; they can lower the volume of the music without distorting the sound and can prevent tinnitus from developing in later years. For anyone using loud electrical appliances, such as hair dryers or vacuum cleaners, or who work in noisy environments such as building sites, where earmuffs are impractical, earplugs are also helpful in reducing noise exposure. This is also the case for while riding motorcycles, mopeds etc. While operating lawn mowers, hammer drills, grinders, and similar, earmuffs may be more appropriate for hearing protection.