Bosch F.01U.294.088, F.01U.294.087 Datasheet
Communications Systems | PRS‑xPxxx‑xx and LBB 4428/00‑xx Power Amplifiers
PRS‑xPxxx‑xx and LBB 4428/00‑xx Power
Amplifiers
1, 2, 4, or 8 audio outputs (selection from 100 / 70 /
▶
50 V outputs)
Audio processing and delay for each amplifier
▶
channel
Amplifier supervision and spare amplifier switching
▶
Loudspeaker line and loudspeaker supervision
▶
(LBB 4428/00‑xx only line supervision)
Eight control inputs and 1, 2, 4 or 8 control outputs
▶
Supervision of line attached to control inputs
▶
Automatic volume control
▶
Two audio inputs (four audio inputs for
▶
LBB 4428/00‑xx)
Redundant network connection
▶
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 shortcircuit 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‑xx) 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‑xx)
•
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)
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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
Installation/Configuration Notes
Parts Included
Quantity Component
1 PRS‑xPxxx‑xx or LBB 4428/00‑xx 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‑xx 115 / 230 VAC ±10%, 50/60 Hz
LBB 4428/00‑xx 100 to 240 VAC ±10%, 50/60 Hz
Power consumption Pmax -3 dB* / idle** / standby
PRS‑1P500‑xx 353 / 39 / 15 W
PRS‑2P250‑xx 354 / 43 / 16 W
PRS‑4P125‑xx 350 / 54 / 20 W
LBB 4428/00‑xx 433 / 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
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
PRS‑1P500‑xx 327 / 29 / 5 W
PRS‑2P250‑xx 327 / 30 / 5 W
PRS‑4P125‑xx 332 / 39 / 10 W
LBB 4428/00‑xx 397 / 63 / 22 W
* Alarm tone level
** With pilot tone 15 V
7 Mains input
8 48 V backup supply
9 Display and control
10 Network processor and DSP
11 Network redundancy switching
12 Power supply
Mic/line inputs 2 x (4 x for LBB 4428/00‑xx)
Connector 6-pole header for removable screw con-
nector (mono, balanced)
Line
Frequency response -3 dB @ 50 Hz and 20 kHz (±1 dB)
S/N >87 dBA
Block diagram
CMRR >40 dB @ 1 kHz
Input range -6 dBV to 6 dBV
Input impedance 22 kohm
Mic
Frequency response -3 dB @ 100 Hz and 16 kHz
Nominal input level -57 dBV
S/N >62 dBA with 25 dB headroom
CMRR 40 dB at 1 kHz
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