Audio Units; Connection With The Mains; Operation; Amplifier - Omnitronic MA Series User Manual

Audio units

• MIC 1: The rear panel provides a balanced XLR input for connecting a microphone. To enable a +48 V
phantom power for condenser microphones set DIP switch 3 to the upper position. Alternatively, use the
unbalanced 6.3 mm jack for connecting a dynamic microphone. The level is adjusted by the "MIC 1"
control.
Caution!
If the phantom power is switched on, no microphone with unbalanced output must be connected. Otherwise
this microphone may be damaged. To prevent switching noise, only switch on phantom power when the
amplifier is switched off or when all output controls are set to minimum.
To enable the priority circuit set DIP switch 4 to the upper position. In case of an announcement via this
input, the level of the other channels is attenuated. After the announcement, the level of the other channels
slowly returns to the original level.
• MIC 2-3/LINE 1-2: These unbalanced 6.3 mm jacks connect both dynamic microphones and units with line
level. Set DIP switch 1 and/or 2 to the lower position for microphone level or to the upper position for line
level. The level is adjusted by the front controls (8) and (9).
• LINE 3-4: Use these unbalanced RCA jacks to connect units with line level (e.g. CD players). The level is
adjusted by the front controls (10) and (11).
• LINE OUT: This unbalanced RCA output provides the mixed signal to connect, e.g. an additional amplifier

Connection with the mains

Finally connect the device to a mains outlet with the mains cable.

6 Operation

Amplifier

1 To prevent loud switching noise, first switch on all other units of the PA system.
2 Prior to switching on, turn the "MASTER" control and the level controls of the input channels to zero to
avoid a high volume at the beginning. Then switch on the unit with the power switch. The "Power"
indicator lights up.
3 Turn up the "MASTER" control so that the mixing ration of the signal sources can be adjusted in an
optimum way.
4 Adjust the desired volume ratio with the level controls of the channels "MIC" and "LINE". Turn the
controls of the inputs not used to zero.
5 To improve the audibility of an announcement via microphone channel 1 set DIP switch 4 to the upper
position. In case of an announcement via this input, the level of the other channels is attenuated. After
the announcement, the level of the other channels slowly returns to the original level.
6 To release the chime prior to an announcement, press the button "CHIME". Then the level of the
channels is attenuated also.
7 Adjust the desired sound with the tone controls. By adjusting the tone controls, the high frequencies
(control "TREBLE") and the low frequencies (control "BASS") can be boosted or attenuated. With the
controls in mid-position, the frequency response is not affected.
8 Adjust the definite level of the total volume with the "MASTER" control. The 5-step LED row shows the
output level. The red "Clip" LED lights up in case of overload. If it lights permanently, slightly turn back
the master control.
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