Lbb 3535/00 Dual Audio Interface Unit - Bosch Digital Congress Network Installation And Operating Manual

Digital Congress Network | Installation and Operating Manual | Chapter 2 - Contribution Equipment
2.9

LBB 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-
2
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.
FIG. 2-16 LBB 3535/00 Dual Audio Interface Unit
Controls, Indicators and Interconnection
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.
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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
4
1
6
dB
18
7
12
6
5
5 0
Attn
INPUT LEVEL
-12 dBV
J1 J2
J2
J1
Open Open
IC 1
Closed Open
IC 8
Open Closed Ambient mic. on input 2
FIG. 2-17 LBB 3535/00 Dual Audio Interface Unit
en | 2-12
8 9
2
+/-3dB Init +/-3dB
10
11
Sym Sym
dB
18 P12
P12
12
6
0
Asym Asym
Attn
12
INPUT LEVEL
-60 dBV -12 dBV -60 dBV
13
Function
Mic. on inputs 1 and 2 (factory setting)
Chairman mic. on input 2, priority panel on input 1
LBB 3535/00 Dual Audio Interface unit