ARC-15 on September 3, 2015 | Marketing Team AR Sync Cable SYNC CABLE FOR MULTI-CHANNEL AR SYSTEMS The AR-15 AR Sync Cable is required for sample-accurate multi-channel AR system. AR-200s can form up to 64 channels of highly reliable sample-accurate playback with no moving parts. An AR-3000R is required as the master. The AR-SYNC cable is also required when several AR units are locked together to time code.