Bose CC‑3D Professional Digital Zone Controller for CSP, ControlSpace ESP & ControlSpace EX (White)In White , the Bose Professional ControlCenter CC 3D Digital Zone Controller provides volume control and A B C D source selection for Bose CSP, ControlSpace ESP, and ControlSpace EX sound processors. It's also compatible with Bose PowerMatch networked amplifiers. Supporting PoE power over an optional PoE switch, the controller simultaneously supports up to 16 Bose CSP processors or 32 ControlSpace EX ESP processors. Features Volume & A B C D Source