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To connect to a new auxiliary device, press the Bluetooth pairing button for around 2 seconds until
the Bluetooth symbol flashes more rapidly. The Bluetooth ID is now visible to other Bluetooth devices.
Activate the Bluetooth function on the auxiliary device and search for nearby Bluetooth devices in
the Bluetooth menu. When the LD PRE ST1 appears under "available devices", you just need to select it
and the connection will be made automatically. If this process is successful, the Bluetooth symbol is
permanently lit on the front of the device and the Bluetooth ID is no longer visible to other devices. This
prevents unauthorized connections to the Bluetooth module. Playback from the auxiliary device can
now be started. To disconnect a currently paired Bluetooth device and to set the Bluetooth module rea-
dy to pair again, press the Bluetooth icon for around 2 seconds. Pair the playback device and connect it
again by selecting LD PRE ST1 from "paired devices" in the Bluetooth menu of the playback device.
MASTER VOLUME CONTROL
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The master volume control is used to adjust the volume of the summed signal of all channels except
the EMERGENCY channel. The EMERGENCY channel bypasses the master volume control, and the signal is
sent directly to the stereo line output, LINE OUT. The master volume control is equipped with a ring-sha-
ped LED display. This LED ring remains dark when there is no signal or only a very weak signal at the
output, and starts to light up white as soon as a sufficient signal level is detected.
PRIO
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LED for the indication of an active priority mode related to MIC/LINE channels (priority levels 2, 3 and 4).
Three situations cause the priority feature of the MIC/LINE channels to engage, thereby causing the
PRIO display field on the front of the device to light up yellow.
1. The VOX circuit is active (input signal level MIC/LINE 1 exceeds the set VOX threshold value).
2. The contact between poles C and + of the terminal block connections for MIC/LINE 1 channel is closed
using a mute switch/button.
3. The chime/signal tone is played.
Further information on the channel priorities and the EMERG and PRIO indicators on the front of the
amplifier can be found in the PRIORITY LEVELS table in these operating instructions.
EMERG
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Indicator for the priority function of the EMERGENCY channel. The EMERG indicator is lit yellow if priority
level 1 is activated by the VOX emergency circuit or a connected mute switch/button (contact closure).
All other input channels are muted during this time. As soon as the contact closure is opened again or
the emergency signal level falls below the VOX threshold value, all channels will be unmuted, and the
EMERG display will be turned off.
STANDBY BUTTON
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Briefly press the standby button to put the preamplifier into standby mode and mute the stereo line
output, LINE OUT. If the standby button is briefly pressed again, the device is ready for operation again.
If standby mode is activated by pressing the standby button, reactivation of the device via the auto-
matic standby function is not available, even if an audio signal is detected.
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