AudioPressBox APB-024 R-EX Passive AudioPressBox Expander 19in Rack UnitA professional press box (Audio Splitter) expander featuring 24 Line MIC outputs in a Rack. Outputs are divided to channel A and channel B so it can also be used for bilingual conferences. Each Output is independet transformer balanced and isolated. It has 2 inputs with 3 pin XLR connectors, one for each Output channel. You can route each Input to Output Channel A or B or both. It also has 2 link Outputs so you can daisy chain additional expanders if