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

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.

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

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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2 | PRS xPxxx xx and LBB 4428/00 xx Power Amplifiers

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

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

1Set of connectors

Installation/Configuration Notes
	9	4
1
		5
	10
2		6
3	11
		7
	12
		8

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

6 Control 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

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
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
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
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