Glensound GS-FW031 Two Channel 4 Wire Subrack With IFBThe GS FW031 is very versatile 2 channel 4 wire subrack. It has been designed to fulfil all the communication requirements of a small OB vehicles, small studios or to act as the communication hub of fly away kit. Features 2 x 4 wire circuits 1 x program audio input 1 x external audio input (not transformer balanced) 4 wire & program audio inputs are transformer balanced Inputs & outputs on rear panel XLRs 4 wire inputs and program input have course