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5 INSTALLATION
5.1 Rack installation
Install the unit on a plane surface or in your rack. For 19" (483 mm) rack installation, 2 units are required
each. You can fix the unit with four screws M6 in the rack. When choosing the installation spot make sure
that there is enough space around the unit for ventilation or that heated air from the rack can be passed on
to improve heat radiation. Steady overheating will damage the unit.
5.2 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 1-5 (white jack = left; red
jack = right):
• Connect units with line level output (e.g. CD players) 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 corresponding 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, several stereo outputs with individual level controls are available:
• Connect the main amplifiers to both master outputs, optionally to the balanced XLR or unbalanced
RCA output.
• If a monitoring system is available, connect the amplifier of the monitoring system to the stereo output
BOOTH. With the corresponding selector switch the output can be switched to mono operation.
4
For analog sound recordings, two recording units can be connected: one unit to the output REC OUT on
the front panel and a further unit to the output REC on the rear panel. For both recording outputs, the
signals of the microphone channels MIC 1 and MIC 2 can be switched on and off with the corresponding
selector
switches.
The recording level is independent of the position of the output controls. With an audio
interface such as the OMNITRONIC DDI 4x4 you can also digitize the analog output signal of the
EM-550 and transfer it to a computer with USB connection.
5
For prefader listening to the input channels or for monitoring the current music program ahead of the
output controls, it is possible to connect stereo headphones to the 6.3 mm jack input PHONES.
6
Connect the power supply unit to the AC input of the EM-550 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 BOOTH, OUT 1, and OUT 2 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 on the front panel lights up. Switch on the connected units. After operation, switch off the unit
with the power switch.
6.1 Level control of channels 1-5
1
Set all gain controls and tone controls to mid-position.
2
Use the input selector buttons to select the signal sources connected to the channels 1-5.
3
To control a channel, feed an audio signal (test signal or music piece) 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
To monitor the signal via the speakers of a PA system connected, advance the corresponding output
control. The signal can also be monitored via headphones (please refer to section 6.4).
5
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.
6
Repeat the steps for the other connected input channels as described above.
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00046891.DOC, Version 2.0
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