The AR84 is an expander audio interface rack for Allen & Heath GLD and Qu digital mixing systems. It provides 8 remote-controlled mic/line preamps and 4 XLR line outputs. Up to two AR84 AudioRacks can be added to a GLD system. The AR84 can be connected directly to the mixer or to the AR2412 AudioRack to expand the number of inputs and outputs in the system. .PZA MORE SPECS