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S-4000 Digital Snake Owner’s Manual 49
6—Using the S-4000 System
Setting the REAC Mode
The S-4000S and S-4000H each feature a REAC MODE switch.
This switch sets the REAC behavior of each device, and determines
how audio is transferred throughout the system. Each unit’s
REAC MODE switch must be set properly for correct system
operation.
The REAC MODE switch has three different settings:
• M— configures the unit as a Master REAC device. A Master REAC device can:
• send audio signals to Slave and Split REAC devices.
• receive audio signals from a Slave REAC device.
• S— configures the unit as a Slave REAC device. A Slave REAC device can:
• receive audio signals from a Master REAC device.
• send audio signals to a Master REAC device.
• SP— configures the unit as a Split REAC device. A Split REAC device can:
• receive audio signals from a Master REAC device (a Split device cannot send audio
signals).
When setting the REAC MODE switches, here are the most important rules you need to know:
• There must be—and can only be—one Master REAC device in a system.
• There must be—and can only be—one Slave REAC device in a system.
• There can be many Split REAC devices in a system.
• In most circumstances, it’s best to make the main stage connection unit the Master REAC device
and the FOH unit the Slave REAC device. (This configuration allows you to split the stage audio
to multiple destinations—see Chapter 7.)
The only time you need to set a unit as a Split REAC device is when you’ve expanded the system with
one or more additional S-4000H units connected via an Ethernet switching hub. In these cases, the
additional units are set as Split REAC devices so that they’re blocked from sending audio to the Master
REAC device—otherwise, they’d conflict with the audio sent to the Master from the Slave.
See Chapter 7 for information on setting up Split REAC devices with an Ethernet switching
hub.