Installation; Rack Installation; Making The Connections; Operation - Omnitronic EM-640 Bedienungsanleitung

5. INSTALLATION

5.1 Rack installation

Install the unit on a plane surface or in a rack. For 19" (483 mm) rack installation, 4 units are required. When
mounting the unit into the rack, please make sure that there is enough space around the device so that the
heated air can be passed on. Steady overheating will damage your device. You can fix the unit with four
screws M6 in the rack.

5.2 Making the connections

Switch off the mixer prior to connecting any units or to changing any existing connections.
1. Connect the stereo audio sources to the corresponding RCA jacks of channels 1 to 4 (white jack = left
channel; red jack = right channel):
• Connect units with line level output (e.g. CD player) to the jacks LINE
• Connect turntables with magnetic system to the jacks PHONO/AUX .
• If your turntable is equipped with a separate ground lead, connect it to the clamping screw GND.
2. You can connect two microphones via XLR plug or 6.3 mm plug to the microphone inputs MIC 1 and
MIC 2 on the front panel.
3. For connecting amplifiers or other subsequent units with line level inputs (e.g. a further mixer, active
speakers), three stereo master outputs are available for each PA zone: a balanced XLR output and an
unbalanced RCA output: outputs MASTER 1 for master channel ZONE 1, outputs MASTER 2 for master
channel ZONE 2, outputs MASTER 3 for master channel ZONE 3.
Via the assignment switches 1 to 3, the input channels can be switched to the individual master channels
as desired.
4. For sound recordings, connect a recording unit to the output REC. The recording level is independent of
the position of the master controls OUT 1 to 3.
5. The input channels and the master channels can be monitored via stereo headphones. Connect the
headphones to the 6.3 mm jack on the front panel.
6. Connect the power supply unit to the power input of the EM-640 and the mains plug to a mains
socket. Use the unit only with the supplied power unit. Always disconnect the mains connector when you
wish to change connections, move the unit to a different place or if it is not used for a longer period.

6. OPERATION

Prior to switching on, turn the output controls OUT 1 to 3 to minimum to avoid damage to the hearing by a
volume which is too high when switching on. Switch on the unit with the power switch. The power indicator
lights up. Switch on the connected units. After operation, switch off the unit with the power switch.

6.1 Level control of channels 1 to 4

1. Set all gain controls and level controls to mid-position.
2. Use the input selector buttons to select the signal sources connected to the channels 1 to 4.
3. To control a channel, feed an audio signal (test signal or music) to the respective input channel and
advance the channel fader to approx. 2/3 of its maximum. Set all other channel faders to zero.
4. Use one of the assignment switches (LED lights) to switch the input channel to the master channel which
is to be used for level control:
button 1 for master channel ZONE 1, button 2 for master channel ZONE 2, button 3 for master channel
ZONE 3.
5. Advance the master control of the master channel used to approx. 2/3 of its maximum.
6. Via the LED level indication of the master channel used, control the level of the input channel with its
gain control. An optimum level control is obtained if level values in the 0 dB range are shown at average
volume. If the red LEDs of the level indication light up, there is an overload of the channel.
The peak LED below the level control also serves as an aid for controlling the level. It should not light up
or only shortly with signal peaks. If it lights permanently, reduce the level with the gain control.
7. Repeat the steps for the other connected input channels as described above.
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