VPA2100U1
3
VELLEMAN
can rise from 95dB up to 115dB. Individual peaks can exceed the 130dB pain level. Such levels are typical for
e.g. motor chain saws.
An Overview on the Different Noise Levels
10dB – Heartbeat
25dB – Whisper
40dB – Average home
50dB – Light traffic
60dB – Normal conversation
70dB – Vacuum cleaner
80dB – Telephone ringing
90dB – Pneumatic drill
100dB – Power mower
120dB – Boom box in car
130dB – Pain level
140dB – Jet plane 30m overhead
•
It is important to know that a 3dB increase will double the sound level. The human hearing only recognises a
doubling of the sound level when the noise level is increased by 10dB. Hearing loss does not depend on the
sound level but on the noise level and starts way before than the pain level.
•
Many a one deceives himself by thinking that noise is something you can get accustomed to. Nothing is further
form the truth!
•
The reason why some people have got accustomed to a certain noise level and are no longer disturbed, is that
they have already suffered hearing loss. The damage makes the hearing insensitive to the frequencies forming
the loudest part of the noise. Getting accustomed to noise does not mean anything other than trying to get along
with hearing loss in everyday life. Hearing loss cannot be recovered and can only be compensated with hearing
aids. Subjectively, hearing loss feels like having dampened ears. This effect weakens with time but loss in hearing
sensitivity is permanent.
•
In order to relax your hearing sufficiently, the noise level should not exceed 70dB for 10 hours. Higher noise levels
during this relaxing period can prevent relaxation and promote permanent hearing damage or hearing loss.
WARNING:
Protect your ears if you want to prevent hearing damage!
7. Description
a.
Front panel (fig. 1)
1.
Power switch
To turn the unit ON or OFF, press this button. Before turning ON the amplifier check all connections and turn
down the level control. A momentary muting is normal when turning the amplifier ON or OFF.
CAUTION:
Always turn on your amplifier last, after all your other connected equipment, and always turn OFF your
power amplifier before your other connected equipment.
