Bosch PRS-xPxxx, LBB 4428-00 User Manual
Communications Systems | PRS‑xPxxx and LBB 4428/00 Power Amplifiers
PRS‑xPxxx and LBB 4428/00 Power
Amplifiers
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u 1, 2, 4, or 8 audio outputs (selection from 100 / 70 /
50 V outputs)
u Audio processing and delay for each amplifier
channel
u Amplifier supervision and spare amplifier switching
u Loudspeaker line and loudspeaker supervision
(LBB 4428/00 only line supervision)
u Eight control inputs and 1, 2, 4 or 8 control outputs
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.
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
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
Immunity
acc. to EN 55103‑2 / EN 50130‑4 /
EN 50121‑4
Emissions acc. to EN 55103-1 / FCC-47 part 15B
Emergency
acc. to EN 60849 / EN 54‑16 /
ISO 7240‑16
Maritime acc. to IEC 60945
Region Certification
Europe CPD
CPD _V3.6_&_V4.0
Installation/configuration notes
2
7
6
5
4
12
11
10
9
3
1
8
1 Audio inputs, 2 x or 4 x
2 Control inputs
3 Plastic optical fiber network
4 Loudspeaker outputs, 1 x, 2 x, 4 x, 8 x
5 Spare amplifier input
6 Control outputs, 1 x, 2 x, 4 x, 8 x
7 Mains input
8 48 V backup supply
9 Display and control
10 Network processor and DSP
11 Network redundancy switching
12 Power supply
Block diagram
Parts included
QuantityComponent
1
PRS‑xPxxx or LBB 4428/00 Power Amplifier
1 Power cord
1 Set of mounting brackets (large) for 19” rack
1
Set of feet
1 Set of connectors
Technical specifications
Electrical
Mains power supply
Voltage
PRS‑xPxxx
115 / 230 VAC ±10%, 50/60 Hz
LBB 4428/00 100 to 240 VAC ±10%, 50/60 Hz
Power consumption Pmax -3 dB* / idle** / standby
PRS‑1P500
350 / 50 / 20 W
PRS‑2P250 350 / 53 / 21 W
PRS‑4P125 350 / 66 / 23 W
LBB 4428/00
430 / 90 / 32 W
* Alarm tone level
** With pilot tone 15 V
Battery power supply
Voltage 48 VDC -10% to +20%
Power consumption Pmax -3 dB* / idle** / standby
PRS‑1P500
330 / 40 / 10 W
PRS‑2P250 330 / 43 / 11 W
PRS‑4P125 330 / 56 / 13 W
LBB 4428/00
400 / 65 / 22 W
* Alarm tone level
** With pilot tone 15 V
2 | PRS‑xPxxx and LBB 4428/00 Power Amplifiers
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