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The audio expander can pass audio into or out of the system. Typical applications are indoor connectivity and audio distribution. Basic function, redundancy can be a single branch, network cabling, audio line input can also be a redundant loop (including 2 road can be configured to microphone input), used in the original language and the simultaneous translation language channel audio output circuit, Used in the original language and the simultaneous translation language channel, simultaneous interpretation for the original language and language channel flexible wiring, the sensitivity of adjustable audio input, which can adjust the audio output level, through the display screen and a single spin/button to configure audio expander, installation personnel for each digital audio expander assign a unique name to identify, through the VU meter readings to monitor the audio input and audio output. Can make use headphones to monitor audio, suitable for desktop or rack installation of 19 inches (2 u) the fuselage, the handle of the easy to handle, power control and indicator through the network, two lines of 16 characters LCD display, is used to display audio expander state and configuration, spin/button, used to browse the LCD menu interconnected components , a stereo headphone output jack in front of 3.5 mm (0.14 inch), on the back of two way optical fiber network connection, Used to connect to the CCU, four-way 3 needle XLR balanced audio line input, with current separation, four-way stereo lotus unbalanced audio line input socket, four-way 3 needle XLR balanced audio circuit output, with current separation, four-way stereo lotus unbalanced audio socket line 8 road control input, output, is used to enable the audio input and output, audio output, no.5 control Used to indicate the channel occupancy status certificate and approval to the European CE certification technical specifications index of electric power supply voltage 24 to 48 VDC power consumption 7.6 W (DC) 30 Hz - 20 kHz frequency response (- 3 dB, rated level) rated electricity at ordinary times of THD < 0.5% crosstalk attenuation > 85 dB, 1 kHz dynamic range > 90 dB SNR > 87 dBA audio line input XLR input rating 0 dBV (plus or minus 6 dB) XLR input + 12 dBV lotus largest outlet rated input + 12 dBV (plus or minus 6 dB) lotus largest input socket 0 dBV audio microphone input rated input 57 dBV (plus or minus 6 dB) maximum input 26 dBV phantom power supply 12 V + / - 1 V, 15 mA XLR output rated output audio line 12 dBV (+ 6 / - 24 dB) XLR output biggest + 12 24 dBV dBV lotus rated output socket (24 dB) + 6 / lotus maximum output socket 0 dBV mechanical index size (high) x width x thick desktop installation, that contains a 92 x 440 x 440 mm (3.6 x 17.3 x 15.7 inches) 19 inch rack installation, Contains a 88 x 88 x 400 mm (3.5 x 19 x 15.7 inches) behind stents 40 mm (1.6 inch) in front of the 360 mm (14.2 inch) installed weight 7 kg (15.4 pounds) of desktop, 19 inch rack installation order color carbon (PH 10736) and silver grey information LBB 4402/00 audio audio expander expander, Praesideo system is provided with 4 audio inputs, 4 audio frequency outputs, 8 control inputs and 5 control outputs, which are powered by Praesideo network and have a frame unit of 2 RU. Order number LBB4402/00