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MIXER AMPLIFIER
1
2
3
1
2
70V
100V
JP802
LBB1903/10
LBB1906/10
LBB1912/10
1
2
3
1
2
3
70V/100V
8 Ohm
JP902
LBB1914/10
en
Internal settings
Setting the VOX for microphone input 1
Input 1 has the option of a voice-controlled priority (VOX), which will overrule all other inputs when it recognizes a voice
signal. To activate this function, set the VOX-jumper (JP406) to ON.
Setting the speech filters
The speech intelligibility can be improved by cutting off the lower frequencies of the signal. To activate this filter for each
microphone input, set the respective filter jumper (JP401 for input 1, JP402 for input 2, JP403 for input 3 and JP405 for
input 4) to ON.
Setting the chime volume
Adjusting the potentiometer VR401 changes the volume of the chime attention signal, preceding a priority call.
Be careful not to adjust VR701; this is a power amplifier factory adjustment.
Setting the output voltage for LBB1903, LBB1906 and LBB1912
Direct outputs for 70 V, 100 V and low impedance (8 Ohm) loudspeakers are provided. Jumper JP802 sets the Call Only
and Mix Only outputs to 70 V or 100 V output. These outputs are controlled by a priority relay. The Call Only output only
provides priority announcements, while the Mix Only output just provides the mixed signals and switches off at priority
calls.
Setting the output voltage for LBB1914
Jumper JP901 sets the Call/Mix, Zone 1, Zone 2, Call Only and Mix Only outputs to 70 V or 100 V output. Setting
JP902 can also set the direct Call/Mix output to 8 Ohm for low impedance loudspeakers. The Call Only and Mix Only
outputs are controlled by a priority relay. The Call Only output only provides priority announcements, while the Mix Only
output just provides the mixed signals and switches off at priority calls. The zone selection buttons control the outputs of
Zone 1 and 2, but priority announcements are always routed to these zones.
3
Mic. 4
Mic. 3
Mic. 4
VOX
Mic. 2
Mic. 1
VR401
Mic. 4
Mic. 3
Mic. 4
VOX
Mic. 2
Mic. 1
VR401
1
10
Mic. 3
Mic. 2
Mic. 1
1
2
3
1
2
3
OFF
ON
Mic. 3
VOX
Mic. 2
Mic. 1
1
2
3
1
2
3
OFF
ON
2
3
1
2
3
100V
70V
JP901
VOX
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