OHM CT-10 Manual - page 4
CT-8 / 10 / 12 / 15 Full Range Loudspeakers
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For more details (UK), check The Control of Noise at Work Regulations 2005.
Noise Level (dBA)
Maximum Exposure Time per 24 Hours
85
8 hours
88
4 hours
91
2 hours
94
1 hour
97
30 minutes
100
15 minutes
103
7.5 minutes
106
3.7 minutes
109
112 seconds
112
56 seconds
115
28 seconds
118
14 seconds
121
7 seconds
124
3 seconds
127
1 second
130-140
less than 1 second
140
NO EXPOSURE
Maximum Recommended Noise Dose Exposure Levels
3. Important safety instructions
1. Read this manual
2. Heed all safety warnings
3. Follow all instructions
4. The user should never incorporate equipment or accessories not approved by Ohm
5. Safety
warnings
Sound systems are capable of producing high sound pressure levels which can lead to a
hearing damage especially in long term exposition.
To prevent damage to hearing avoid being too close to speakers in operation.
The generally accepted standard to minimize hearing risk is based on an exposure to
85 dBA for a maximum limit of eight hours per day, followed by at least ten hours of recovery
time at 70 dBA or lower (at which the risk of harm to healthy ears is negligible). Then
a “3 dB exchange rate” formula is applied, which means that for every 3 dB above 85 dBA,
the maximum exposure time is cut in half.
Noise levels above 140 dB are not considered safe for any period of time, however brief. For
children, the World Health Organization recommends no exposure above 120 dB.