Bosch F.01U.294.085 Datasheet

Communications Systems | LBB 442x/xx Power Amplifiers

LBB 442x/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) 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 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 (4 audio inputs for LBB 4428/00)

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

Interconnections

•Mains input

•Battery backup input

•Two system network connections

•Two mic/line inputs (four for LBB 4428/00)

•100 V, 70 V or 50 V outputs (for each amplifier channel)

•50 V output

•Eight programmable control inputs

•Control output (for each amplifier channel)

•Headphone output

•Spare amplifier connection (for each amplifier channel)

www.boschsecurity.com

2 | LBB 442x/xx Power Amplifiers

Certifications and Approvals

Region	Certification
Europe	CE	CE
		Traction
	TUEV-	TUV Certificate IEC60849
	SUED
	GL	GL-SOLAS

Safety	acc. to IEC 60065-98		Rear view of LBB 4421/10 Power Amplifier 1 x 500 W
Immunity	acc. to EN 55103 2	/ EN 50130 4
Emissions	acc. to EN 55103-1	/ FCC-47part 15B
EVAC (TÜV certified)	acc. to IEC 60849

Installation/Configuration Notes

	9
1
	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

4

5Rear view of LBB 4422/10 Power Amplifier 2 x 250 W

Rear view of LBB 4424/10 Power Amplifier 4 x 125 W

Rear view of LBB 4428/00 Power Amplifier 8 x 60 W