LD Systems IMA 30 Bedienungsanleitung Seite 6

2 FUSE
Fuse holder for 250 V micro fuses (5 x 20 mm). IMPORTANT: Replace the fuse only with a fuse of the same type. Follow the instructions printed on the
housing. In the event of repeated fuse failure, please contact an authorised service centre.
ON/OFF
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Rocker switch for switching the device on and off.
4 EMERGENCY
Five-pin terminal block connection for installing an acoustic emergency system. The pins +, - and G form the balanced line in. Pins C and + the con-
nection are for a separate mute switch (terminal block included). The VOX (Voice Operated Exchange) control allows users to set an audio threshold
for the emergency input to trigger an automatic mute circuit. When the emergency input level reaches that threshold, all other microphones and
line channels are muted to ensure that the emergency signal can be clearly and distinctly heard The EMERG display field on the front of the device
is also lit. As soon as the emergency signal level drops below the defined threshold, the other channels are unmuted and the EMERG display field
turns OFF. When set accordingly, the EMERGENCY channel has the highest priority among all channels. The emergency signal is sent directly to the
internal amplifier and to the loudspeaker output. The master volume control has no influence over the emergency signal. The emergency signal
volume is set using the GAIN control. The Emergency contact closure (pins C and +) allows muting of all other input channels, independently from
the VOX setup. If the VOX control is set to minimum (all the way left), the muting feature via the VOX circuit is deactivated and the EMERGENCY
channel can be used as a extra line channel.
MIC/LINE 1
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Microphone/line channel with switchable chime feature. Both the combined XLR/jack combo socket or the terminal block connection can be used
as signal input. The pins +, - and G of the terminal block connection form the balanced input. Pins C and + the connection are for an external mute
button or switch (terminal block included). If a line signal is present at the combined XLR/jack combo socket or at the terminal block connector,
switch the MIC/LINE 1 channel to line sensitivity by depressing the corresponding MIC/LINE switch into the LINE position. If a microphone is attached,
set it in the non-depressed MIC position. When using a condenser microphone, also switch the 24 V phantom power on (switch PHANTOM ON/
OFF to the depressed ON position). Ensure that the microphone is already connected and that the channel's volume is set to minimum before
switching the phantom power on. Before disconnecting the microphone, ensure that the phantom power is already switched off and that the
channel's volume is set to minimum. The chime signal's volume is set using the CHIME control. If the internal chime is triggered, channels MIC/LINE
1, MIC/LINE 2, and MUSIC are muted during the duration of the chime signal. The VOX control allows to set an audio threshold for MIC/LINE 1 input,
to trigger an automatic mute circuit that mutes MIC/LINE 2 and MUSIC channels as soon as the input level reaches the defined threshold. The VOX
control allows to set an audio threshold for MIC/LINE 1 input, to trigger an automatic mute circuit that mutes MIC/LINE 2 and MUSIC channels as
soon as the input level reaches the defined threshold. The PRIO LED in the front panel is turned ON when both the contact closure or the VOX circuit
are triggered. When the input signal level drops below the defined threshold, the channels are unmuted, and PRIO LED is turned OFF. When set
accordingly, the MIC/LINE 1 has priority over MIC/LINE 2 and MUSIC. Set the channel's volume using control 1 on the front of the device.
MIC/LINE 2
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Microphone/line channel. Either the RCA (cinch) sockets or the terminal block connection can be used as signal input. The pins +, - and G of the ter-
minal block connection form the balanced input (terminal block included). If a line level signal is present at the terminal block connection, switch
the MIC/LINE 2 channel to line sensitivity by depressing the corresponding MIC/LINE switch into the LINE position. If a microphone is attached to the
terminal block connection, set it to the non-depressed MIC position. When using a condenser microphone, also switch the 24 V phantom power on
(switch PHANTOM ON/OFF in the depressed ON position). Ensure that the microphone is already connected and that the channel's volume is set to
minimum before switching the phantom power on. Before disconnecting the microphone, ensure that the phantom power is already switched off
and that the channel's volume is set to minimum.
Tip: Use the contact closure (pins C and +) on MIC/LINE 1 channel to also give MIC/LINE 2 channel priority over MUSIC. External switches for both MIC/
LINE 1 and MIC/LINE 2 can be connected in parallel to the contact closure input.
7 MUSIC
Line channel for connecting additional playback devices such as a CD or MP3 player. A Bluetooth module is also built into the MUSIC channel. Two
stereo line input signals can be connected to the RCA (cinch) sockets available in the rear panel. One with a CD icon, and other with a cable icon. Use
the touch-sensitive control on the front panel to select the desired signal source. Any stereo signals that are present are internally summed to mono.
8 AUX OUT
The AUX OUT line output with terminal block connection can be used, for example, to send a signal to an external amplifier, an active subwoofer or a
MOH (Music On Hold) telephone system (terminal block included). The MUSIC-MIX switch allows sending of only the selected signal source from the
music channel (MUSIC position), or the full mix of all channels (MIX position).
Please note: The factory setting is that the EMERGENCY channel signal is routed to the AUX OUT line output with an internal jumper. To modify
this setting, the device must be opened and the corresponding jumper removed. To do so, please read the information found under "JUMPER FOR
EMERGENCY SIGNAL ON AUX OUT" in these instructions.
SPEAKER OUTPUT
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The loudspeaker output with terminal block connection (terminal block included) offers the option to connect either a low impedance loudspeaker
with a total impedance of at least 4 ohm (switch LO-Z HI-Z to position LO-Z) or a 70 V/100 V loudspeaker (switch LO-Z HI-Z to position HI-Z). Please use
the corresponding pin assignment illustrated below the terminal block connection. Adjust the sound of the loudspeaker's signal to your needs by
using the tone controls BASS and TREBLE. Please ensure that the total output of the connected loudspeaker roughly corresponds to the amplifier
performance.
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