Omnitronic GEQ-231 Mode D'emploi page 17

INPUTS
A good cable run improves the sound quality remarkably. Input cables should be short and direct, since high
frequencies will be mostly be absorbed if the cables are unnecessarily long. Besides that a longer cable may
lead to humming and noise trouble. If long cable runs are unavoidable, you should use balanced cables.
The inputs of your OMNITRONIC GEQ-231
connectors.
OUTPUTS
The high damping factor of your equalizer supplies a clear sound reproduction. Unnecessarily long and thin
cables will influence the damping factor and thus the low frequencies in a negative way. In order to
safeguard good sound quality, the damping factor should lie around 50.
The outputs of your OMNITRONIC GEQ-231 are equipped with 6.35 jacks, XLR and screw connectors.
CONNECTION TO THE MAINS
Connect the OMNITRONIC GEQ-231 only after having made sure that the right voltage (230 V) is available.
This device features a T 0.5 A, 250 V fuse.
Connect the device to the mains with the enclosed power supply cable.
The occupation of the connection cables is as follows:
Cable Pin
Brown Live
Blue Neutral
Yellow/Green Earth
The earth has to be connected!
If the device will be directly connected with the local power supply network, a disconnection switch with a
minimum opening of 3 mm at every pole has to be included in the permanent electrical installation.
The device must only be connected with an electric installation carried out in compliance with the IEC-
standards. The electric installation must be equipped with a Residual Current Device (RCD) with a maximum
fault current of 30 mA.
STARTING UP
Make sure to power-up before your power amplifier is turned in order to avoid loud transients which could
damage your speakers or annoy your audience.
STARTERS' GUIDE TO EQUALIZERS
At first glance, a graphic equalizer may appear to be a complicated device, but actually, in theory and
operation, a graphic equalizer is a very simple device. Most people are familiar with bass and treble tone
controls. These controls work by dividing the audio signal into two frequency bands - the low frequencies and
the high frequencies. The bass knob, then, effectively becomes a volume control for the lows and the treble
knob gives us volume control over the highs.
"Hz" stands for "Hertz". "KHz" stands for "thousands of Hertz". These are measures of sound-cycles per
second. You see, sound waves are measured by the number of cycles or vibrations they make in one
second. Very low-pitched sounds like bass guitars have far fewer cycles per second than high-pitched
sounds like cymbals. So, if you want to increase the volume of the cymbals in a recording without affecting
the volume of the bass guitar, use the treble control.
The cymbals occupy only a very small band of frequencies within those controlled by the treble control. Also
included in the range of the treble control are vocal sounds. They occupy a similarly narrow band of
frequencies somewhat lower than the cymbals. A treble control alone does not offer enough flexibility of
control to allow us to increase the volume of the cymbals without also increasing
the volume of the vocals. What is needed is a type of control that divides the audio signal, not into two
bands, but as many bands as possible. This would allow us almost unlimited flexibility of control over the
tone "colors" in our audio program.
are equipped with XLR and ¼" jack-sockets and screw
International
L
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17/26 00026057.DOC, Version 1.0