LD Systems IMA 120 Bedienungsanleitung Seite 12

GAIN: Control for adjusting the pre-amplification of the incoming audio signal. Adjust the gain control
so that the channel's clip LED only lights up briefly during signal level peaks. Avoid permanent glow of
the clip LED by reducing the pre-amplification. It may also be necessary to reduce the signal level on
the source device.
CLIP: The red CLIP LED indicates when the input is operated at the distortion limit. Reduce the signal
level on the GAIN control or on the playback device so that the CLIP LED is no longer lit.
VOX: The VOX control allows you to set an audio threshold for an automatic mute circuit for MIC/LINE
input 1, so that the MIC/LINE 2 and MUSIC channels are muted as soon as the input signal reaches the
predefined level. The PRIO LED on the front lights up when the NO contact or VOX circuit is active.
As soon as the input level of the emergency signal falls below the set threshold, the muting of the
channels is cancelled again and the PRIO LED goes out. If configured accordingly, MIC/LINE 1 has priority
over MIC/LINE 2 and MUSIC. Adjust the channel volume using control 1 on the front of the unit.
MIC/LINE 2
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Microphone/line channel with switchable gong function (signal tone). The connection can be made
via the RCA sockets (line level, a stereo signal is summed mono) or via terminal block. In this case, the
poles +, - and G on the terminal block connection are intended for the balanced input signal.
MIC/LINE: If a line signal is present at the terminal block connection, switch MIC/LINE channel 2 to LINE
mode via the associated MIC/LINE switch (switch pressed). If a microphone is connected to the terminal
strip connector, activate MIC mode via the MIC/LINE switch (switch not pressed).
PHANTOM ON/OFF: When using a condenser microphone, it is necessary to activate the 24 V phantom
power supply (PHANTOM ON/OFF switch pressed: ON). Always make sure that the microphone is
connected and the channel volume is set to minimum before switching on the phantom power.
Before disconnecting the microphone from the unit again, deactivate the phantom power and turn
the channel volume to minimum.
GAIN: Control for adjusting the pre-amplification of the incoming audio signal. Adjust the gain control
so that the channel's clip LED only lights up briefly during signal level peaks. Avoid permanent glow of
the clip LED by reducing the pre-amplification. It may also be necessary to reduce the signal level on
the source device.
CLIP: The red CLIP LED indicates when the input is operated at the distortion limit. Reduce the signal
level on the GAIN control or on the playback device so that the CLIP LED is no longer lit.
CHIME: The volume for the gong/signal tone is controlled by the CHIME control on the back of the
amplifier. When the control is turned all the way to the left, the gong/signal tone circuit is deactivated.
If the internal gong/signal tone function is active, the MIC/LINE 1, MIC/LINE 2 and MUSIC channels are
muted for the duration of the signal tone. The signal tone is triggered by means of a push-button with
normally open function, which is connected to the contacts C and + of channel MIC/LINE 1.
Adjust the channel volume using control 2 on the front of the unit.
MUSIC
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Line channel for integrating playback devices such as CD or MP3 players (a stereo signal is summed mono).
The MUSIC channel is additionally equipped with a Bluetooth module. RCA sockets for connecting two
stereo line input signal sources are available at the rear (CD symbol or cable symbol). The desired signal
source is selected via a touch-sensitive button on the front of the amplifier. Adjust the channel volume
using the MUSIC control on the front of the unit.
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