Data sheet en_us_1886736267
- 1. Communications Systems | LBB 1920/00 Plena Universal Pre-Amplifier LBB 1920/00 Plena Universal Pre- Amplifier ▶ Four universal low-noise input channels for microphone or line ▶ Separate tone control, speech filter and direct output per channel ▶ Selectable blocking, serial and mixing priorities ▶ Multifunctional inter-connection point ▶ Priority and emergency relay outputs ▶ Master volume control The Plena Pre-Amplifier is a versatile, high-performance Balanced XLR interconnection input and output are unit with four mono-input channels. It fulfills a wide provided in combination with an insertion/cascade variety of public address requirements at a surprisingly selector. In insertion mode an external sound processing low cost. device, e.g. an equalizer, can be connected between these connections. In the cascade mode, multiple LBB1920/00 pre-amplifiers can be cascaded to increase the number of Functions input channels to 8, 12, or even more. Internally the interconnection input can be switched as an emergency All input channels provide the choice of a balanced 3‑pin input with a signal level detector (VOX). If an emergency XLR-connector for microphone or line level (selectable), a audio signal is detected, this channel overrides all others. balanced 5‑pin DIN-connector for microphone or line level The emergency input channel has its own volume preset with priority contact, or a line level stereo cinch- and bypasses the master volume control. connector, converted to mono. Microphone inputs have a phantom power supply. Each input channel has its own For the emergency input another VOX activated relay is volume and tone control, a selectable speech filter to provided to trigger external equipment or for local volume reduce the bass content of the speech signal for improved control override. An overload protected 24 VDC output intelligibility, and a balanced, direct output on XLR, that provides power for driving external relays, making an bypasses the channel controls. external power supply unnecessary. Three priority modes are available for the input channels. An additional microphone level output is available on the In blocking mode the input channel that is activated first DIN connector, parallel to the balanced XLR master gets priority over all other input channels. In serial mode output. This provides an input signal for a mixing desk or input channel 1 has priority over channels 2, 3 and 4; a microphone input channel for a mixer amplifier, such as channel 2 has priority over channels 3 and 4; and channel the Plena LBB 19xx/10. A tape output is also available. 3 has priority over channel 4. Each of the input channels The master output channel, or one of the input channels, can be mixed to the master output, irrespective of can be selected to be monitored with headphone priority, by separately setting that channel to the mixing connector and LED meter. mode. www.boschsecurity.com
- 2. 2 | LBB 1920/00 Plena Universal Pre-Amplifier Controls and indicators Parts Included Front Quantity Component • LED power level bar • Power on indication LED (green) 1 LBB 1920/00 Plena Universal Pre-amplifier • Power button 1 Power cord • Four treble control knobs 1 19”mounting brackets • Four bass control knobs • Four channel volume control knobs 1 Plena CD • Master volume control knob 1 Installation and User Instructions • Headphone channel selection knob Back • Mains voltage switch Technical Specifications • Insertion/ cascade switch Interconnections Electrical Front Mains power supply • Headphone jack Voltage 230/115 VAC, ±15%, 50/60 Hz Back Inrush current 1.5 A at 230 VAC / 3 A at 115 VAC • Four channel inputs, each consisting of: - One DIN connector (priority) Max power consumption 25 VA - One XLR connector Battery power supply - Two cinch connectors Voltage 24 VDC, +15% / -15% • Four direct channel outputs • Tape output Current max 1A • Earth connection screw Performance • Emergency relay output • 24 V DC backup power input Frequency response 50 Hz to 20 kHz (+1 / -3 dB) • 24 V DC output Distortion <0.5 % • Insertion / cascade / emergency input Bass control ±10 dB at 100 Hz • Insertion / cascade output • Master line output (XLR) Treble control ±10 dB at 10 kHz • Master mic output (priority) Channel separation >70 dB at 1 kHz • Mains socket Priority mute >40 dB Dynamic range 100 dB Mic/line inputs 4x Certifications and Approvals Connectors 3-pin XLR / 5-pin DIN, balanced Region Certification Sensitivity 1 mV (microphone), 200 mV (line) Europe CE Declaration of Conformity Impedance >1 kohm (microphone), >5 kohm (line) S/N (flat at max volume) >63 dB (microphone), >70 B (line) Safety acc. to EN 60065 S/N (flat at min volume/muted) >75 dB Immunity acc. to EN 55103-2 CMRR >40 dB (50 Hz – 20 kHz) Emission acc. to EN 55103-1 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 mic mode only Installation/Configuration Notes Line inputs 4x Connector Cinch, unbalanced, stereo converted to mono Sensitivity 200 mV Impedance 22 kohm S/N (flat at max volume) >70 dB S/N (flat at min volume/muted) >75 dB Headroom >25 dB Direct outputs 4x LBB 1920/00 rear view Connector 3-pin XLR, balanced
- 3. LBB 1920/00 Plena Universal Pre-Amplifier | 3 Mains power supply Ordering Information Nominal level 1V LBB 1920/00 Plena Universal Pre- LBB1920/00 Impedance <100 ohm Amplifier high-performance unit with four mono-input Master output 1x channels. Connector 3-pin XLR, balanced Nominal level 1V Impedance <100 ohm Master output 1x Connector 5-pin DIN, balanced Nominal level 4 mV (microphone level) Impedance <100 ohm Tape output 1x Connector Cinch, 2 x mono Nominal level 350 mV Impedance <1 kohm Headphone output 1x Connector 6.3 mm jack stereo, signal mono Nominal level 3V Impedance <100 ohm Emergency input 1x Connector 3-pin XLR, balanced Sensitivity 200 mV (interconnection), 100 mV to 1V adjustable (emergency) Impedance >10 kohm VOX Threshold 45 mV (emergency) Interconnection output Connector 3-pin XLR, balanced Nominal level 200 mV Impedance <100 ohm Relays Priority Relay Contacts 30 V, 1 A Emergency Relay Contacts 30 V, 1 A DC supply output 24 V, 250 mA max Mechanical Dimensions (H x W x D) 100 x 430 x 270 mm (19" wide, 2U high) Weight Approx. 5 kg Mounting Standalone, 19” rack Color Charcoal Environmental Operating temperature -10 ºC to +55 ºC (+14 ºF to +131 ºF) Storage temperature -40 ºC to +70 ºC (-40 ºF to +158 ºF) Relative humidity <95% www.boschsecurity.com
- 4. 4 | LBB 1920/00 Plena Universal Pre-Amplifier Americas: Europe, Middle East, Africa: Asia-Pacific: Represented by Bosch Communications Systems Bosch Security Systems B.V. Robert Bosch (SEA) Pte Ltd 12000 Portland Avenue South P.O. Box 80002 11 Bishan Street 21 Burnsville, Minnesota 55337, USA 5600 JB Eindhoven, The Netherlands Singapore 573943 Phone: +1-800-392-3497 Phone: + 31 40 2577 284 Phone: +65 6571 2600 Fax: +1-800-955-6831 Fax: +31 40 2577 330 Fax: +65 6571 2698 audiosupport@us.bosch.com emea.securitysystems@bosch.com apr.securitysystems@bosch.com www.boschsecurity.com www.boschsecurity.com www.boschsecurity.com © Bosch Security Systems Inc. 011 | Data subject to change without notice T866222091 | Cur: en-US, V22, 27 Jan 2011