Back to top
Send SMS Send Inquiry
Home » Products » BOSCH Praesideo Voice Evacuation System » Praesideo Digital Public Address And Emergency Sound System

Praesideo Digital Public Address And Emergency Sound System

Praesideo Digital Public Address And Emergency Sound System
Praesideo Digital Public Address And Emergency Sound System
Send Inquiry
Product Code : PA
Brand Name : BOSCH
Product Description

 Features:-

There are four types of power amplifier units in the Praesideo product range. These differ in the number of amplifier channels per frame and the power ratings of the individual amplifier channels.

The types of power amplifiers are as follows:

  • LBB 4421/10 1 x 500 W Power Amplifier
  • LBB 4422/10 2 x 250 W Power Amplifier
  • LBB 4424/10 4 x 125 W Power Amplifier
  • LBB 4428/00 8 x 60 W Power Amplifie

The power amplifiers can be selected for 100 V, 70 V and 50 V output tapping. Audio input is provided via the fiber optic network cable. The power amplifiers are equipped with amplifier monitoring and change-over relays. The amplifier provides short-to-ground and short-circuit detection functions. If an end-of-line supervision card is plugged in, the loudspeaker lines are also monitored for open circuits. The pilot tone for the monitoring is generated in the power amplifier itself. The power amplifiers are equipped with audio processing facilities for each amplifier channel. It is possible to have 3 parametric equalizer sections and 2 shelving equalizers. The power amplifiers can be connected to the network line directly. Ambient microphone connection enables output level adjustment for maximum intelligibility. The power amplifier has a provision for connecting a 48 V DC backup power supply. The 48 V is protected against reverse polarity, and availability of the 48 V supply is continuously monitored.

Technical Specification

Air pressure

600 to 1100 h Pa

Mixer Type

Powered Mixer

Amplifier Power

500 watt

Wireless

No

Voltage

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

Brand

BOSCH

Mike Set Type

Wired

in front of brackets

40 mm (1.6 in)

Weight LBB 4421/10

13 kg (28.7 lb)

Storage temperature

-40 degC to +70 degC (-40 degF to +158 degF)

S/N

62 dBA with 25 dB headroom

Relative humidity

15% to 90%

Rated output power (per channel)

250 W (1 min. at 55 degC) 125 W (30 min. at 55 degC,cont. at 30 degC) 60 W (cont. at 55 degC)

Rated load resistance

80 ohm (100 V); 40 ohm (70 V)

Rated load capacitance

125 nF (100 V); 250 nF (70 V)

Power consumption

Pmax -3 dB* / idle** / standby

Phantom supply

12 V +-1 V @ 15 mA

Operating temperature

-5 degC to +55 degC (+23 degF to +131 degF)

Nominal input level

-57 dBV

Input range

-7 dBV to +8 dBV ref nominal input value

Input impedance

1360 ohm

Frequency response

-3 dB @ 100 Hz and 16 kHz

Dimensions (H x W x D)

92 x 440 x 400 mm (3.6 x 17.3 x 15.7 in)

Connector

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

CMRR

40 dB at 1 kHz


GROMAX TECHNOLOGIES PVT. LTD.
X


GROMAX TECHNOLOGIES PVT. LTD.
Delhi,India
S-548, 2nd Floor, School Block Part 2, Mother Dairy Road, Shakarpur, Delhi - 110092, India
Phone :+918068214368
Mrs Chauhan (Managing Director)
Mobile :+918068214368

Product Showcase