Sennheiser EK 3052, Instructions For Use Manual

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17 Attention! High Volume!
You use this transmission system for professional purposes. This commercial use is subject to
the rules and regulations of the trade association responsible. Sennheiser as the manufacturer
is therefore obliged to expressly point out possible health risks arising from use.
This system is capable of producing sound pressure exceeding 85 dB(A). 85 dB(A) is the
sound pressure corresponding to the maximum permissible volume which is by law (in
some countries) allowed to affect your hearing for the duration of a working day. It is
used as a basis according to the specifications of industrial medicine. Higher volumes or
longer durations can damage your hearing.
At higher volumes, the duration must be shortened in order to prevent damage. The
following simple formula applies:
Double the volume = half the duration
An increase of 3 dB corresponds to doubling the volume; you can thus go by the following
table:
Maximum duration at a sound pressure of:
8 hours 85 dB
4 hours 88 dB
2 hours 91 dB
1 hour 94 dB
30 minutes 97 dB
15 minutes 100 dB
8 minutes 103 dB
4 minutes 106 dB
2 minutes 109 dB
1 minute 112 dB
Pain threshold 120 dB
The following are sure signs that you have been subjected to excessive noise for too long a time:

You can hear ringing or whistling sounds in your ears.

You have the impression (even for a short time only) that you can no longer
hear high notes.

After using this system, your hearing is impaired for a short time.
In all of the above cases, you should consult a specialist or at least have your hearing
tested.
Damage to the organs of hearing builds up gradually. Once the initial symptoms have
died down, you no longer perceive acute changes. In the long term, however, the repeated
effects of loud noises can cause severe hearing impairment or even deafness.
EK 3052, BDA 4/98 20.11.2003, 9:24 Uhr 24