Bosch Appliances LBB 1925/10 Plena System Pre-Amplifier, Controls and indicators Front, Back

2 LBB 1925/10 Plena System Pre-Amplifier

Each zone has a tri-state control on the front panel that can turn it off, switch it to the call channel, or to the BGM channel. The all‑call microphone input and emergency activation override the call station selection on the call channel. Each zone has separate priority overrides with preset volume levels. This assures an appropriate message volume, independent of any local volume settings, such as for BGM. Both three‑wire and four‑wire override schemes are supported. An override also activates a voltage-free contact (call-active) available for external control and monitoring. The master output channel, or one of the input channels, can be monitored through the headphone connector and/or the LED VU‑meter.

Controls and indicators

Front

•LED power meter

•Power on LED

•Call active LED

•Three knobs for mic/line volume, treble, and bass levels

•Three knobs for BGM volume, treble, and bass levels

•BGM source selection knob

•Six zone-selections keys

•Six zone status LEDs

•On/off switch

Back

•EMG input volume control

•Mains voltage switch

Interconnections

Front

•Headphone jack

Back

•One (DIN or XLR) Mic/line input

•Two (DIN/DIN) call station inputs

•PC audio (cinch) input

•Priority input

•Master (XLR) output

•BGM (XLR) output

•Emergency signal input

•Two trigger inputs

•RS-232 (DE-9)

•Three (cinch) CD, tape, aux inputs

•Six 100 V speaker outputs

•24 VDC output

•24 VDC input

•Three control inputs

•Ground screw

•IEC mains socket

Certifications and approvals

Safety	acc. to EN 60065
Immunity	acc. to EN 55103-2
Emission	acc. to EN 55103-1

Region Certification

EuropeCE

Installation/configuration notes

LBB 1925/10 rear view

Parts included

Quantity Component

1LBB 1925/10 PLENA System Pre-amplifier

1Power cord

1Set of 19”mounting brackets

1Plena CD

1Installation and User Instructions

Technical specifications

Electrical

Mains power supply

Voltage	230/115VAC, ±15%, 50/60 Hz
Current inrush	230/115 VAC, 1.5/3 A
Max power consumption	25 VA
Battery power supply
Voltage	24 VDC, +10% / -15%
Current max	1 A
Performance
Frequency response	50 Hz to 20 kHz (+1 / -3 dB)
Distortion	<0.5%
Bass control	±10 dB @ 100 Hz
Treble control	±10 dB @ 10 kHz
Channel separation	>70 dB @ 1 kHz
Priority mute	>40 dB
Dynamic range	100 dB
Mic/line input	1 x
Connectors	5‑pin DIN, 3‑pin XLR, balanced, with
	phantom power
Sensitivity	1 mV (mic), 200 mV (line)