Sonifex Redbox RB-DMX4, User Handbook Manual, Page: 14 / 36

2
Redbox RB-DMX4 User Handbook
INTRODUCTION
INTR
ODUC
TION
1
Auto Lock Mode
The digital output sample rate follows the sync input. If the sync signal is removed then the
output sample rate will be set by, and locked to, the internal on-board clock generator at
the closest frequency available to the previous sync input.
Slave Mode
In this mode the digital output sample rate follows the sync input. When the sync signal is
not present the digital output is turned off.
There is a monitor socket on the front panel with a gain pot to allow you to monitor the
output of each channel. The monitored channel can be selected via a push button on the
front panel which, when held, can also supply up to 12dB of gain. If the level that is being
monitored is close to full scale, a 12dB attenuation can be added to the monitor channel
via a DIPswitch on the rear panel.
The unit can be placed in mono or stereo mode via rear panel DIPswitch. Stereo mode
allows you to monitor the two input pairs as stereo channels as well as controlling the
input gain as a pair, giving tied audio levels.
The RB-DMX4 has been designed to have a passive signal path through the main input, so
if power to the unit fails, signal inputs 1 & 2 are routed to outputs 1 & 2 and signal inputs
3 & 4 are routed to outputs 3 & 4. This is essential for applications such as installation at
transmitter sites, where a power failure to the unit should not prevent the audio input
signal from being output to the transmitter. Please note that this is not true for the TOSLink
outputs which are muted.
The RB-DMX4 can be controlled using Sonifex free software, SCi. Contact Sonifex for further
information if you have a particular requirement that isn’t catered for by the RB-DMX4 as
standard.
Fig 1-2: RB-DMX4 System Block Diagram
S/PDIF
S/PDIF
Optical
AES
Optical
S/PDIF
Freq Select
AES Sync
Word Clock
Video Optional
Digital Source
Select
Digital Input 1
Digital Input 2
Clock
Select
Master
Clock
Generation
VID RX
AES RX
WC RX
AES
RX SRC
AES
Optical
S/PDIF
RX SRC
DSP
Digital Output 2
Digital Output 1
AES
Optical
TX
TX
Power
Failure
Relay
Power
Failure
Relay