Sound Pressure Levels
Continual exposure to sound above 85dB will cause a gradual hearing loss, and louder
sound will accelerate the damage. The permitted exposure time for unprotected ears
decreases by ONE HALF for EACH 5dB INCREASE in average sound level.
For instance, exposure is limited to 8 hours at 90dB, 4 hours at 95dB, and 2 hours at
100dB. The highest permissible sound level exposure for the unprotected ear is 115dB
for 15 minutes per day. Any exposure to 140dB sound causes pain and even brief
exposure injures unprotected ears.
Hearing loss usually develops over a period of several years, painless and gradual
without calling attention to itself. Take no chances, hearing loss is permanent.
Usher speakers are designed for very loud, wideband, dynamic and undistorted playback.
Care should be taken to optimize volume level when enjoying music.
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