Communications Systems | PRS xPxxx and LBB 4428/00 Power Amplifiers
PRS xPxxx and LBB 4428/00 Power
Amplifiers
www.boschsecurity.com
There are four types of Power Amplifier units in the Praesideo product range. These differ in the number of amplifier channels per frame: one, two, four, or eight. The overall power rating is 500 watts for all of the amplifiers.
The Power Amplifiers can be set to 100 V, 70 V and 50 V output tappings. They have short-to-ground and short-circuit detection functions, and can generate their own pilot tone for supervision purposes.
Functions
The Power Amplifiers receive input signals over the network. They also have two auxiliary audio inputs (four for LBB 4428/00) for local audio. Their eight control inputs are freely programmable for system actions, and priorities can be assigned to these inputs. Each control input has the ability to monitor the attached line for open and short-circuits. Control outputs are freely programmable for faults and call related actions.
u1, 2, 4, or 8 audio outputs (selection from 100 / 70 / 50 V outputs)
uAudio processing and delay for each amplifier channel
uAmplifier supervision and spare amplifier switching
uLoudspeaker line and loudspeaker supervision (LBB 4428/00 only line supervision)
uEight control inputs and 1, 2, 4 or 8 control outputs
The 2 x 16 character display and the rotary control enable local status enquiries. The display shows the VU meter reading, when the audio monitoring mode is active. Audio can be monitored by headphone.
The units are self-monitoring and continually report their status to the network controller. They support both single branch and redundant loop cabling. The amplifiers have a changeover facility for spare power amplifier switching. Changeover relays are included with the units. The amplifiers have a 48 V DC back-up supply input.
The digital audio processing can handle three parametric equalization sections and two shelving equalization sections per channel with configurable audio delay.
Controls and indicators
•2 x 16-character LCD for status display
•Rotary/push control button
•Mains switch
•Voltage selector for PRS xPxxx
2 | PRS xPxxx and LBB 4428/00 Power Amplifiers
Interconnections
•Mains input
•Battery backup input
•Two system network connections
•Two mic/line inputs (four for LBB 4428/00)
•Selectable 100 V, 70 V or 50 V outputs (per channel)
•Fixed 50 V output
•Eight programmable control inputs
•Control output (for each amplifier channel)
•Headphone output
•Spare amplifier connection (for each amplifier channel)
Certifications and approvals
Safety |
acc. to IEC 60065 / EN 60065 |
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Immunity |
acc. to EN 55103 2 / EN 50130 4 / |
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EN 50121 4 |
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Emissions |
acc. to EN 55103-1 / FCC-47 part 15B |
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Emergency |
acc. to EN 60849 / EN 54 16 / |
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ISO 7240 16 |
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Maritime |
acc. to IEC 60945 |
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Region Certification
Europe CPD
CPD _V3.6_&_V4.0
Installation/configuration notes
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1 Audio inputs, 2 x or 4 x
2Control inputs
3Plastic optical fiber network
4 Loudspeaker outputs, 1 x, 2 x, 4 x, 8 x
5Spare amplifier input
6Control outputs, 1 x, 2 x, 4 x, 8 x
7Mains input
8 48 V backup supply
9Display and control
10Network processor and DSP
11Network redundancy switching
12Power supply
Block diagram
Parts included
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PRS xPxxx or LBB 4428/00 Power Amplifier |
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Power cord |
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Set of mounting brackets (large) for 19” rack |
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Set of feet |
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Set of connectors |
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Technical specifications |
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Electrical |
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Mains power supply |
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Voltage |
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PRS xPxxx |
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115 / 230 VAC ±10%, 50/60 Hz |
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LBB 4428/00 |
100 to 240 VAC ±10%, 50/60 Hz |
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Power consumption |
Pmax -3 dB* / idle** / standby |
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PRS 1P500 |
350 / 50 / 20 W |
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PRS 2P250 |
350 / 53 / 21 W |
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PRS 4P125 |
350 / 66 / 23 W |
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LBB 4428/00 |
430 / 90 / 32 W |
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* Alarm tone level |
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** With pilot tone 15 V |
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Battery power supply |
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Voltage |
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48 VDC -10% to +20% |
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Power consumption |
Pmax -3 dB* / idle** / standby |
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PRS 1P500 |
330 / 40 / 10 W |
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PRS 2P250 |
330 / 43 / 11 W |
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PRS 4P125 |
330 / 56 / 13 W |
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LBB 4428/00 |
400 / 65 / 22 W |
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* Alarm tone level |
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** With pilot tone 15 V |
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