4 CHANNEL BIDIRECTIONAL XLR BALANCED AUDIO TO FIBRE OPTIC CONVERTER – SUPPORT 4 CHANNELS OF BALANCED AUDIO BIDIRECTIONAL TRANSMISSION. BROADCAST STANDARD ANALOG BALANCED AUDIO. USING FPGA, DIGITAL CODING/DECODING AND CLOCK RECOVERY TECHNOLOGY. HIGH INTEGRATION AND HIGH STABILITY. AUDIO INTERFACE IS XLR CANNON HEAD BALANCE INTERFACE. HIGH DYNAMIC RANGE OF 100 DB. INTELLIGENT NOISE CONTROL SYSTEM: FOR SOFT RISING OR FALLING SLANT WAVES AND ANALOG NOISE WITH 100DB SNR IN BLAST-FREE OPERATION.