Your ears are being damaged LONG before 150 db. Exposure to sounds in excess of 90 db for an extended period of time can cause hearing damage (that is the reason that OSHA regulates noise levels above 90 db in the workplace). Even brief exposure to sounds above 140 decibels can result in pain and permanent hearing damage.
For those who don't know, every time you increase the sound level 10 db, it is 10 times as loud, or put another way, sound level doubles for every 3 db increase. A normal conversation is 60-70 db, a power saw is 110 db. 140 db is the sound of a jet engine from 100 feet away and 144 db is over twice that loud.
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