BOSCH LBB4428/00 Power Amplifier 8X60W

BOSCH LBB4428/00 Power Amplifier 8X60W (US - not for sale in Canada)

Power Amplifier come in four types of 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 are capable to be set to 100 V, 70 V and 50 V output tappings. They come along with short-to-ground and short-circuit detection functions and possible to generate their own pilot tone designed for supervision purposes.

The Power Amplifiers are capable of receiving input signals over the network. They also come along with two auxiliary audio inputs (four for LBB 4428/00) intended for local audio. Their eight control inputs are made freely programmable for system actions and priorities are possible to be assigned to these inputs. Each control input comes with the ability for monitoring the attached line for open and short-circuits. Control outputs are freely programmable designed for faults and call related actions. The 2 x 16-character display and the rotary control are enabling the local status inquiries. The display is made for showing the VU-meter reading, during the audio monitoring mode is active.

Audio are possible to be monitored by headphone. The units are made self-monitoring and continually report their status to the network controller. They are capable of supporting both single branch and redundant loop cabling. The amplifiers come along with a changeover facility designed for spare power amplifier switching. Changeover relays are made included along with the units. The amplifiers come along with a 48 V DC back-up supply input. The digital audio processing are possible to 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)

Features

• Eight 60 W audio outputs with audio processing and delay (selection from 100 / 70 / 50 V outputs)
• Amplifier supervision and spare amplifier switching
• Loudspeaker line supervision
• Eight control inputs and eight control outputs
• Supervision of line attached to control inputs
• Automatic volume control
• Four audio inputs
• Redundant network connection
• Audio processing and delay for each amplifier channel
• Loudspeaker line and loudspeaker supervision (LBB 4428/00 only line supervision)

Electrical: Mains power supply

Voltage

100 to 240 VAC +/-10%, 50/60 Hz

Power consumption

Pmax -3 dB (Alarm tone level)/ idle (With pilot tone 15 V)/ standby: 430 / 90 / 32 W

Electrical: Battery power supply

Voltage

48 VDC -10% to +20%

Power consumption

Pmax -3 dB (Alarm tone level)/ idle (With pilot tone 15 V)/ standby: 397 / 63 / 22 W

Mic/line inputs

Mic/line inputs

2 x (4 x for LBB 4428/00)

Connector

6-pole header for removable screw connector (mono, balanced)

Line

Frequency response

-3 dB at 50 Hz and 20 kHz (+/-1 dB)

S/N

>87 dBA

CMRR

>40 dB at 1 kHz

Input Range

-6 dBV to 6 dBV

Input impedance

22 kOhm

Mic

Frequency response

-3 dB at 100 Hz and 16 kHz

Nominal input level

-57 dBV

S/N

>62 dBA with 25 dB headroom

CMRR

40 dB at 1 kHz

Input impedance

1360 Ohm

Phantom supply

12 V +/-1 V at 15 mA

Input range

-7 dBV to +8 dBV ref nominal input value

Control inputs

Control inputs

8

Connectors

Removable screw terminals

Operation

Closing contact (with supervision)

Control outputs

Control outputs

1 x per amplifier channel

Connectors

Removable screw terminals

Performance

Frequency response

80 Hz to 19 kHz (-3 dB)

S/N

>85 dB (no pilot tone)

Crosstalk

<80 dB at nominal load for 1 kHz

Distortion

<0.3% (at 1 kHz) at 50% of rated output power

Loudspeaker outputs

Rated load resistance

166 Ohm (100 V); 83 Ohm (70 V); 42 Ohm (50 V)

Rated load capacitance

30 nF (100 V); 60 nF (70 V); 120 nF (50 V)

Rated output power (per channel)

60 W (1 min. at 55 deg. C)
30 W (30 min. at 55 deg. C, cont. at 30 deg. C)
15 W (cont. at 55 deg. C)

Connector

9-pole header for removable screw connector

Environmental

Operating temperature

-5 to +55 deg. C (23 to 131 deg. F)

Storage temperature

-20 to +70 deg. C (-4 to 158 deg. F)

Relative humidity

15% to 90%

Air pressure

600 to 1100 h Pa

General

Mounting

Standalone; 19"-rack

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

Dimensions (HxWxD)

3.6 x 17.3 x 15.7" (91.44 x 439.42 x 398.78mm) (for tabletop use, with feet)
3.5 x 19 x 15.7" (88.90 x 482.60 x 398.78mm) (for 19" rack use, with brackets), In front of brackets: 1.6" (40.64mm), Behind brackets: 14.2" (360.68mm)

Weight

34.83 lbs (15.80kg)