Waves DSPRO StageGrid 4000Built ruggedly in a robust 4U rack mountable chassis, StageGrid 4000 is designed with the challenges of the road in mind, and with no compromise in audio quality. All of StageGrid 4000's components were carefully selected and tested to ensure continuous system stability and maximum dependability, including a redundant power supply. This way you can focus on what really matters creating a consistent, impactful sonic experience, show after show.