LD LDPREST1, User Manual, Page: 6 / 36

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6
4
EMERGENCY
5-pole terminal block connection for the installation of an acoustic emergency call system. The poles +, - and G correspond to a balanced line
input. Poles C and + are used for the connection of a separate mute switch (terminal block included in the packaging). The contact closure of the
EMERGENCY channel (Poles C and + closed) mutes all other input channels, regardless of the VOX settings.
CLIP:
The red CLIP LED indicates, the input is being operated at the distortion limit. You should reduce the signal level using the GAIN control or the
volume control on the playback device so that the CLIP LED is no longer lit.
VOX:
The VOX control (Voice Operated Exchange) makes it possible to set a threshold for the emergency audio signal in order to activate an
automatic mute switching circuit. When the level at the EMERGENCY input reaches the set threshold, all other microphone and line channels are
muted. This ensures that the emergency signal can be heard clearly. In addition, in this case the EMERG indicator is lit on the front of the amplifier.
As soon as the level of the emergency signal falls below the set threshold, the other channels are no longer muted and the EMERG indicator goes
out. With this setting, the EMERGENCY channel always has the highest priority. The emergency signal is routed directly to the audio output LINE OUT
internally.
If the VOX control is set to minimum (turned all the way to the left), automatic muting via the VOX switching circuit is deactivated and the
EMERGENCY channel can be used as an additional line channel.
GAIN:
Control to set the pre-amplification of the corresponding audio signal. Set the Gain control such that the Clip LED of the channel only lights up
briefly when the signal level peaks. Avoid the Clip LED being permanently lit by reducing the pre-amplification. It may also be necessary to reduce
the signal level on the playback device. The level of the emergency signal is not influenced by the current setting of the main volume control
(master volume), but is set via the GAIN control.
5
MIC/LINE 1
Microphone/line channel with switchable chime function (signal tone). The connection can be made via the XLR/jack combo socket as well as the
terminal block. In this case, the poles +, - and G are provided on the terminal block connection for the balanced input signal.
Poles C and + are used for the connection of a separate mute switch (terminal block included in the packaging). The contact closure offers the
possibility to mute the MUSIC channel using an external switch/button. In addition, the internal chime/signal tone function can be activated in this
way when the circuit is enabled (see point 6 MIC/LINE 2, CHIME).
MIC/LINE:
If there is a line signal on the XLR/jack combo socket or the terminal block, switch the MIC/LINE channel 1 to LINE mode using the
corresponding MIC/LINE switch (switch pressed). If a microphone is connected, activate MIC mode using the MIC/LINE switch (switch not pressed).
PHANTOM ON/OFF:
When using a condenser microphone, you need 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 turning on phantom power. Before you
disconnect the microphone from the device again, deactivate the phantom power and turn the channel volume to minimum.
GAIN:
Control to set the pre-amplification of the corresponding audio signal. Set the Gain control such that the Clip LED of the channel only lights up
briefly when the signal level peaks. Avoid the Clip LED being permanently lit by reducing the pre-amplification. It may also be necessary to reduce
the signal level on the playback device.
CLIP:
The red CLIP LED indicates, the input is being operated at the distortion limit. You should reduce the signal level on the GAIN control or the
volume control on the playback device so that the CLIP LED is no longer lit.
VOX:
The VOX control makes it possible to set an audio threshold value for an automatic mute circuit for MIC/LINE input 1, that mutes MIC/LINE 2
and MUSIC channels as soon as its input signal reaches the predefined level. The PRIO LED is lit on the front if the contact closure or VOX circuit is
activated. As soon as the input level of the emergency signal falls below the set threshold, the channels are no longer muted and the PRIO LED goes
out. In such a configuration, MIC/LINE 1 has priority over MIC/LINE 2 and MUSIC. Adjust the volume of the channel using control 1 on the front of the
device.
6
MIC/LINE 2
Microphone/line channel with switchable chime function (signal tone). The connection can be made via the RCA sockets (line level, a stereo signal
is summed to mono) as well as the terminal block. In this case, the poles +, - and G are provided on the terminal block connection for the balanced
input signal.
MIC/LINE:
If there is a line signal on the terminal block connection, switch the MIC/LINE channel 2 to LINE mode using the corresponding MIC/LINE
switch (switch pressed). If a microphone is connected to the terminal block connection, activate MIC mode using the MIC/LINE switch (switch not
pressed).
PHANTOM ON/OFF:
When using a condenser microphone, you need 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 turning on phantom power. Before you
disconnect the microphone from the device again, deactivate the phantom power and turn the channel volume to minimum.
GAIN:
Control to set the pre-amplification of the corresponding audio signal. Set the Gain control such that the Clip LED of the channel only lights up
briefly when the signal level peaks. Avoid the Clip LED being permanently lit by reducing the pre-amplification. It may also be necessary to reduce
the signal level on the playback device.
CLIP:
The red CLIP LED indicates, the input is being operated at the distortion limit. You should reduce the signal level on the GAIN control or the
volume control on the playback device so that the CLIP LED is no longer lit.
CHIME:
The volume for the chime/signal tone is controlled via the CHIME control on the back of the amplifier. If the control is turned all the way to
the left, the chime/signal tone circuit is disabled. If the internal chime/signal tone function is active, MIC/LINE 1, MIC/LINE 2 and MUSIC channels are
muted for the duration of the signal tone. The signal tone is initiated with the help of a button which is connected to contacts C and + of the MIC/
LINE 1 channel.
Adjust the volume of the channel using control 2 on the front of the device.