Specifications

Bosch Security Systems | 2003-09 | 3922 988 99483en
Plena System Pre-amplifier | Installation and Operating Manual | en | 21
7 Internal settings (call stations)
7.1 C h i m e
Figure 7.1
The chime for the all-call call station (LBB 1941) is set inside the LBB 1925 system pre-amplifier. The chime for the
6-zone call station (LBB 1946) is set within the call station with DIP switch S8 (bit 3 to 8). The chime volume can be
set with VR1. You can find the chime tone tables at the end of the document. The priority for a call station (LBB
1946) can be set with the switch S8 (bit 1 and 2) as shown in figure 7.1.
7.2 Setting sensitivity & speech filter
Figure 7.2
The sensitivity of the call station microphone can be set with the jumpers JP2, JP3 and JP4. Which jumper activates
which sensitivity can be found in the table. The speech filter can be enabled or disabled with jumper JP5.
Internal settings
ON
OFF ON
CN2
S8
U4
JP5
VR1
CN3
CN1
JP2
+6dB
JP3 JP4
0dB
-15dB
18
Priority
Priority 2 (highest)
Priority 1 (lowest)
not allowed
not allowed
0
1
0
1
1
0
0
1
S8-1 S8-2
Symm.
Output level
(dBV)
+6.8dBV
+6dBV
-3dBV
+6 dB
+79 +85 +94 +100 +124
-15 dB
Jumper Settings
JP2 +6dB
JP3 0dB
JP4 -15dB
Input/Output ratio 20:1
Acoustical input level (dBSPL)
0dB