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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 | 13-9
Electrical data
13.5 Electrical data
13.5.1 Microphones (General)
Freq. response : 100 - 16.000 Hz
Transducer type : Condenser
Directional pattern : Cardioid
Max. SPL for THD <3% : 110 dB
Equivalent input noise level : 24 dB (A)
Sensitivity index (dB)
Pluggable microphones LBB 3549/xx
Overload microphone level : 110 dB SPL
Nominal microphone level : 85 dB SPL±2dB (1kHz)
Typical frequency response ; 100 - 16000 Hz
External microphone for CONCENTUS units
Element : Electret condenser
Polar pattern : omni-directional
Operating voltage : 5V d.c.
Sensitivity : -62 dB (0 dB = 1V/µbar, 1000 Hz) at load 1.2 KOhms
Frequency response : 100 Hz - 14 kHz
13.5.2 Headphones
Light weight stereo headphones LBB 3443/00
Impedance : 32 Ohms
Frequency response : 50 Hz - 20 kHz (-10 dB)
Max. power : 98 dB SPL/Earpiece at 1 mW/Earpiece
Weight : 70 g (0.16 lb)
Colour : Charcoal with silver
Under the Chin headphones LBB 3441/00
Impedance LBB 3015/04:300 Ohms
Frequency response:50 Hz - 15 kHz (-10dB)
Max. power:60 mW
Sensitivity:107 dB SPL/Earpiece at 0 dbV/*
Weight:33 g (0.07 lb)
Colour:black
Interpreter headphones LBB9095/30
Impedance:2 x 720 Ohms
Frequency response:250 Hz to13 kHz (-10 dB)
Max. power:200 mW
Sensitivity:97 dB SPL/Earpiece at 0 dbV/*
96 dB SPL/Earpiece at 1 mW/*
Weight:78 g (0.17 lb)
Colour:black/grey
* = System
Single earphone LBB 3442/00
Impedance:32 Ohms
Frequency response:100 Hz to 5 kHz (-10 dB)
Max. power:5 mW
Sensitivity:114 dB SPL at 1mW/*
Weight:25 g (0.06 lb)
Colour:dark grey
Dynamic headphones LBB 3015/04 and LBB 9095/30
Impedance:360 Ohms (LBB 9095/30 2 x 720 Ohms)
Frequency response:250 Hz to 13 kHz (-10 dB)
Max. power:200 mW
Sensitivity:97 dB SPL at 0 dBV/*
96 dB SPL at 1mW/*
Weight:90 g (0.19 lb)
Colour:black/grey
13.5.3 Transmission links
• From delegate microphone to interpreter headphone
• From delegate microphone to delegate headphone
• From interpreter microphone to delegate headphone
• From interpreter microphone to interpreter headphone
• From auxiliary input to delegate headphone
• From auxiliary input to interpreter headphone
• From delegate microphone to auxiliary output
• From interpreter microphone to auxiliary output
Frequency response : 125 Hz - 14.000 Hz *
Harmonic distortion : < 0.5%
Harmonic distortion at overload : < 1%
Crosstalk attenuation at 4 kHz : > 80 dB
Dynamic range : > 90 dB
* Intercom links 125 - 3.500 Hz