Bosch Plena LBB 1925 - Technical Data

PLENA SYSTEM PRE-AMPLIFIER AND CALL STATIONS
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System pre-amplifier LBB 1925
Electrical
Mains voltage 230 V/115 Vac, (15%, 50/60 Hz)
Max mains power consumption 50 VA
Battery voltage 24 Vdc, +20%/-10%
Max battery current 1 A
Performance
Frequency response 50 Hz - 20 kHz (+1/-3 dB)
Distortion <0.5%
Call channel
Bass control -6/+6 dB at 160 Hz
Treble control 0/+12 dB at 5 kHz
BGM channel
Bass control 0/+20 dB at 100 Hz
Treble control 0/+18 dB at 15 kHz
Channel separation at 1kHz >65 dB
Priority mute >50 dB
INPUTS
Call station inputs
(8-pin DIN, balanced, for LBB1941/00 and/or LBB1946/00)
Sensitivity 1 V
Data RS485, 1200, N, 8, 1, 0
Mic/Line input (3-pin XLR/5-pin DIN, balanced)
Sensitivity 1 mV (microphone), 200 mV (line)
Impedance >1 kOhm (microphone), >5 kOhm (line)
S/N (flat at max volume) >63 dB (microphone), >70 dB (line)
S/N (flat at min volume/muted) >75 dB
CMRR >40 dB (50 Hz - 20 kHz)
Headroom >25 dB
Speech filter -3 dB at 315 Hz, high-pass, 6 dB/oct
Phantom power supply 16 V via 1.2 kOhm, in microphone mode only
BGM input (Cinch, unbalanced, stereo converted to mono)
Sensitivity 500 mV (CD), 200 mV (aux, tape)
Impedance 22 kOhm
S/N (flat at max volume) >70 dB
S/N (flat at min volume/muted) >75 dB
Headroom >25 dB
PC input (Cinch, unbalanced, stereo converted to mono)
Sensitivity 1 V
Impedance 22 kOhm
S/N >70 dB
Emergency/telephone input (Screw, balanced)
Sensitivity 100 mV to 1V adjustable
Impedance >10 kOhm
VOX threshold 50 mV
S/N >65 dB
OUTPUTS
Master output
(3-pin XLR, balanced)
Nominal level 1V
Impedance <100 Ohm
BGM output (3-pin XLR, balanced)
Nominal level 1 V
Impedance <100 Ohm
Tape output (Cinch, 2x mono)
Nominal level 350 mV
Impedance 3.3 kOhm
Headphone output (6.3-mm jack stereo, signal mono)
Nominal level 3 V
Impedance <100 Ohm
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Technical data