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Bosch Security Systems | 04-2003 | 3922 988 43318 en
Digital Congress Network | Installation and Operating Manual | Chapter 13 - Technical Data
en | 13-10
Electrical data
13.5.4 Combined units
• Delegate microphone with transmission link to interpreter headphone
• Delegate microphone with transmission link to delegate headphone
• Delegate microphone with transmission link to auxiliary output
• Interpreter microphone with transmission link to interpreter headphone
• Interpreter microphone with transmission link to delegate headphone
• Interpreter microphone with transmission link to auxiliary output
Typical frequency response : 125 Hz (-8 dB) - 14.000 Hz (-8 dB)
Front-to random sensitivity index : > 4.6 dB
Rated equivalent sound pressure level
due to inherent noise : < 25 dB (A)
Total harmonic distortion at overload : < 1 %
Crosstalk attenuation : > 80 dB
13.5.5 System Electrical and Electro-acoustical characteristics
Nominal input level : 85 dB SPL
Overload input level : 110 dB SPL
Automatic gain reduction at Overload
input level (not applicable to
PA-floor output) : 30 dB (interpretation channels)
18 dB (loudspeaker channel)
Automatic gain reduction with : 3 dBm (2 microphones on)
- 6 dBm (4 microphones on)
Operator master gain control : 15 x 1.5 dB and OFF (Mute)
Loudspeaker gain control : 14 x 1.5 dB and OFF
13.5.6 System environmental conditions
Temperature range:
• Transport:-20 to +55 °C (-65 to 131° F)
• Operational:+5 to +45 °C (+41 to 113° F)
• Relative humidity:95% max.
• Safety:acc. to EN 60065, and: acc. to CAN/CSA E65-94 and UL6500 (UL and cUL) for LBB
3500/xxD, LBB 4106/00D and LBB 3508/00D
• EMC emission:acc. to harmonized standard EN 55013 (1988)and FCC rules (part 15) complying
with the limits for a class A digital device.
• EMC immunity:acc. to harmonized standard EN 55020 (1987)
• EMC approvals:affixed with the CE mark, EC directive 89/336 EEC
• Shock resistance:acc. to IEC 86.2.29 Eb
• Vibration resistance:acc. to IEC 68.2.6 Fc, procedure A
NOTE: The maximum operational temperature for ALL operational contribution units
with LC-display is 40°C. The maximum operational temperature for the Ext. Power supply
unit LBB 4106/.. is +40°C.
Safety Standards for North America
• Approvals (CSA, C and USA):CAN/CSA E65 -94 UL 6500
13.5.7 Interface data
LBB 3500/.. Central Control Unit
• Line in/outputs:-18 dBV/ +12 dBV* (nominal/maximum)
• Recorder input/output:-33 dBV/ -3 dBV(nominal/maximum)
* -12 dBV / +18 dBV when used as symmetrical output..
LBB 3508/00 Audio Media Interface Unit
Symmetrical line outputs (XLR)
• Channels 0 up to 11 (Interpretation):+1 dBV/1 dBV (nominal/maximum)
• Channels 12 and 14 (PA):-8 dBV/ +22 dBV
• Channel 13 (del. loudspeaker):+1 dBV/ +13 dBV
Asymmetrical line outputs (Cinch)
• Channels 0 pot 11 (Interpretation) :-10 dbV/ -10 dBV (nominal/maximum)
• Channels 12 and 14 (PA):-19 dBV/ +11 dBV
• Channel 13 (del. loudspeaker):-10 dBV/ +2 dBV
13.5.8 Mains supply
LBB 3500/05 (D), LBB 3500/15 (D), : 105 - 115 - 125 - 220 - 230 - 240 V
LBB 3500/35 (D), LBB 4106/00 (D), + 6% / -10 %
LBB 3508/00 (D)
NOTE: Upon delivery : 230 V
125 V (D-versions)
13.5.9 Power consumption (nominal)
LBB 3500/05 (D) : 175 W
LBB 3500/15, LBB 3500/35 (D) : 350 W
LBB 4106/00 (D) : 350 W
LBB 3508/00 (D) : 175 W
