Operation - Omnitronic MTC Series User Manual

5 Operation

Selecting the operating mode
Use the rear selector switch to choose the desired mode:
• position STEREO:
• position BRIDGE:
Switching on/off and adjusting the level
1) To prevent loud switching noise, always switch on all other units of the amplifier system before
switching on the power amplifier. After operation, switch off the power amplifier first. Prior to switching
on set all level controls to the left stop position and make sure that the operating mode selector switch
is set to the correct position.
2) Switch on the amplifier with the power switch. The protection indicators light up for about 10 seconds. If
they do not, check if the amplifier is connected to the mains correctly. After the turn-on delay the
speakers are activated (protection indicators are off). Afterwards the power indicator ON lights up and
indicates that the amplifier is switched on. In bridge mode the indicator BRIDGE lights up.
3) First, set the volume controls of the preamplifiers to zero and turn the level controls of the amplifier to
mid-position. There should be no loud humming. Should humming persist, check the connection cables
between the preamplifier and the amplifier (switch off components before).
4) Adjust the level controls to the desired volume value. The SIG indicator will light up when a specific
signal level has been reached. In case of overload the CLIP indicator lights up. If it lights continuously,
turn back the corresponding level control.
5) For switching off, follow the inverse sequence: always switch off the amplifier first and then the audio
sources.
Protective circuits
The integrated protective circuits prevent damage to the speakers and the amplifier. If activated, the
speakers are electrically separated from the amplifier and the PROT indicator lights up:
• for around 10 seconds after switching-on until the speaker outputs are ready for operation
• in case of overheating of the amplifier
• in case of under voltage at the amplifier
• in case of a short-circuit at a speaker output
• in case of a DC voltage at a speaker output
If the red PROT indicator lights up during operation or if it does not go out after switching on, the amplifier
has to be switched off and the cause of the fault has to be removed.
All channels are operated independent of each other.
Bridge mode (The input signal of channel 1/3/5/7 is additionally switched to
channel 2/4/6/8. A signal at channel 2/4/6/8 is ignored and volume
adjustment is made with the level controls for channel 1/3/5/7.
14 • EN