The device shown is an Ashly Protea 4.24SP (or 4.8SP) Digital Signal Processor (DSP).
Key details include:
Function: A rack-mountable digital speaker processor / crossover unit used for live sound reinforcement, system management, speaker tuning, equalization, delay, and limiting.
Inputs/Outputs: Features 4 inputs and up to 8 outputs (indicated by the channel select controls on the right panel).
Screen Display: The backlit LCD currently displays a preset configuration: "Preset 01: 4 in 2-Way Crossover".