Bosch Appliances Philips LBB 3500: Understanding Dual Audio Interface Features

Digital Congress Network Installation and Operating Manual Chapter 2 - Contribution Equipment en 2-12

2.9LBB 3535/00 Dual Audio Interface unit

The LBB 3535/00 allows a variety of microphones, as well as line sources, to be connected to the DCN system. The unit can be used in combination with the LBB 3536/xx Hand microphone when mounting in seat armrest etc., or with the LBB 3537/xx Microphone with Control Panel when flush- mounting into table-tops etc.

The unit includes two separate inputs, each selectable for use with either a microphone or line input source. Each input can be assigned with its own seat number, providing two delegate or chairman positions.

Two 3.5 mm jack sockets provide the connection to headphones or to loudspeaker panels LBB 3538/ 00, or a combination of both.The output is switched off when the corresponding input is switched on.

10.Initialization LED indicator.The LED illuminates when the unit is not being initialized.The LED is Off when the unit has been initialized.

11.Selector switch for selecting an asymmetrical microphone input, or a symmetrical microphone/ line level input, or a symmetrical microphone input with Phantom power supply (12 V/680 Ohm).

12.Input attenuation selection of: 0, 6, 12 or 18 dB. Factory setting: 6 dB.

13.Microphone or line level select switch.

1 2 3

1 2 1 2

89

6

5

4

7 5

1
	+/-3dB
dB	Sym
18	P12
12
6
0	Asym
	Attn

INPUT LEVEL

-12 dBV -60 dBV

2

Init +/-3dB

dB	Sym
	P12
18
12
6
0	Asym
	Attn

INPUT LEVEL

-12 dBV -60 dBV

10

11

12

FIG. 2-16 LBB 3535/00 Dual Audio Interface Unit

Controls, Indicators and Interconnection (Chapter 2.17)

13

1.6-pole circular connector for loop through system.

2.2 x loudspeaker output connectors (marked 1 and 2) (3.5 mm jackplug socket).The loudspeaker is muted automatically when the corresponding microphone is on.

3.2 x balanced audio input (marked 1 and 2) for line level (-12 dBV) or microphone level (-60 dBV) sources with or without a phantom power supply). (2 x 8-pole 262° DIN-type socket).

4.2 m long cable terminated with a moulded 6-pole circular connector.

5.2 x screw holes for securing the unit.

6.Switch panel with cover.

7.Tie-wrap holes for securing connected cables.

8.Initialization button (INIT) used for initializing the unit during installation. Also used to reset the unit’s address (De-Init).

9.Input 1 and 2: ± 3 dB input level potentiometer for fine adjustment.

IC 8

IC 1

J2

J1

J1	J2	Function
Open	Open	Mic. on inputs 1 and 2 (factory setting)
Closed	Open	Chairman mic. on input 2, priority panel on input 1
Open	Closed	Ambient mic. on input 2

FIG. 2-17 LBB 3535/00 Dual Audio Interface Unit

Bosch Security Systems 04-2003 3922 988 43318 en LBB 3535/00 Dual Audio Interface unit