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