Operating Determinations - Omnitronic MPVZ-180.6 User Manual

10 dB Heartbeat
20 - 30 dB Whisper
40 dB Average home
50 dB Light traffic
60 dB Normal conversation
70 dB Vacuum cleaner
It is important to know that doubling the power increases the noise level by 3 dB. The human hearing does
only recognizes a doubling of the sound level when the noise level is increased by 10 dB. Damaging the
hearing does not depend on the sound level but on the noise level and starts way before the pain level.
Many people deceive themselves by thinking that noise is something they can get accustomed to. It is
possible that a positive opinion of a certain noise can reduce the physiological reaction, but the slow impacts
on the inner hearing must not be neglected: over stimulation and continuous elimination of the Cortic organ's
hair cells.
The reason why some people have got accustomed to a certain noise level and are no longer disturbed is
that they have already suffered a hearing damage. This damage make the insensitive to those frequencies
forming the loudest part of the noise. Getting accustomed to noise does not mean anything other than trying
to get along with the hearing loss in everyday life. The hearing loss itself cannot be healed, it can only be
compensated by hearing aids.
Subjectively, the hearing loss feels like dampened ears. This effect weakens with the time, but a loss in
hearing sensitivity often remains.
In order to relax the hearing sufficiently, the noise level should not exceed 70 dB(A) for 10 hours. Higher
noise levels during this relaxing period can prevent the relaxation and promote a permanent hearing damage
(Tinitus) or hearing loss.
Therefore: Whoever wants to maintain his hearing should use hearing protectors!

4. OPERATING DETERMINATIONS

The PA mono mixing amplifiers of the MPVZ series have been specially designed for the use in 100 V PA
systems. 100 V outputs for six PA zones are available whose volume can be adjusted separately.
Alternatively, PA speakers with 70 V and 100 V audio transformers or 4-16  speakers can be connected to
the direct outputs. It is possible to connect three microphones and three units with line level to the six inputs
which can be mixed with each other. Microphone channel 1 is equipped with a priority function which
reduces the volume of the other signal sources in case of an announcement. A chime can be released prior
to an announcement. For connection to units with line level (e.g. mixer) an additional stereo RCA output is
available.
This product is allowed to be operated with an alternating current of 230 V, 50 Hz and was designed for
indoor use only.
This device is designed for mobile use and for permanent installations.
By operating amplifying systems, you can produce excessive sound pressure levels that may lead to
permanent hearing loss. Please refer to the explanations under "Legal instructions".
Please note: operating an amplification system in public or industrial areas, a series of safety instructions
have to be followed that this manual can only give in part. The operator must therefore inform himself on the
current safety instructions and consider them.
Do not shake the device. Avoid brute force when installing or operating the device.
When choosing the installation spot, please make sure that the device is not exposed to extreme heat,
moisture or dust. There should not be any cables lying around. You endanger your own and the safety of
others!
Overview on the different noise levels
80 dB Heavy traffic or telephone ringing
90 dB Pneumatic drill
100 dB Power mower
120 dB Boom box in car
130 dB Pain level
140 dB Jet plane 30 meters overhead
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