JBL CSR-3SV Zone ControllerUsing CSR 3SV remote control with your CSM 21 or CSM 32 zone mixer, you can remotely control the source on the mixer and the volume of the source. The JBL Commercial CSR series remote controls, including CSR V, CSR 2SV, and CSR 3SV, can use analog DC voltage to provide logic control ranging from source selection and volume. Wired with Cat 5 cable with universally accepted RJ 45 connectors up to 1000 feet (305 m) length, the CSR series remote controls