Word: db
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Dates: during 1960-1969
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...With these," says Dr. Robert Feder, a Beverly Hills ear specialist, "everything is reamplified many times, and the noise becomes nearly intolerable." Dr. Victor Goodhill of Hollywood reports that sound levels in many rock-'n'-roll night clubs soar to 125 db. Dr. Charles P. Lebo of the University of California took measuring instruments into two San Francisco rock-'n'-roll joints, where the cacophony was produced mainly by amplified guitars and percussion instruments (see diagram). Throughout the audible-speech range, Lebo found that the sound intensity averaged over 100 db at virtually all frequencies...
What to Say? Individuals vary in their sensitivity to loud noise. Lebo estimates that 10% of the people in such a hall would show no effects, 80% would have their hearing threshold raised by five to 30 db, and 10% would suffer a 40-db impairment, at least temporarily. As for permanent damage, some might suffer it after a week or two of steady listening, while others could take it for a year...
...what he said in the car on the way home. Singleton recruited a research team and tested the hearing often 14-year-old ninth-graders an hour before a dance. Then tne investigators went to the dance hall, and found the average sound intensity to be 106 to 108 db in the middle of the dance floor. Directly in front of the band it peaked to 120 db. The test crew had to move 40 feet outside the building before the level dropped to a safe but still uncomfortable 90 db...
After the dance, the kids' hearing was tested again. Despite the youthful resiliency of their inner ears, all had suffered at least temporary hearing impairment, with the average loss at about 11 db. One boy showed a 35-db loss. The greatest damage was in the high-frequency speech range, involving consonantal sounds, similar to the loss felt by oldsters who complain that "everybody mumbles nowadays...
...James Jerger and his wife Susan, who is also his research assistant at the Houston Speech and Hearing Center, got similar results after testing the members of a five-man combo. One player had a 50-db temporary loss, and three had already suffered a slight but permanent loss, although none was older than...