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Synchronization 359
Synchronizing MADI Devices
Whenever two MADI devices are connected together, care must be taken to ensure they are properly synchronized or the audio will
suffer from clicks, pops and distortion (even if the devices are operating at the same sample rate).
• In simple configurations where you are clocking a single external device with a single S6L system, the device providing
source audio (whether S6L or the external device) can serve as the master word clock source.
• When two S6L systems are exchanging MADI, special word clock requirements apply.
• When sending MADI from S6L to an external MADI device, synchronization can also be achieved by configuring that exter-
nal device to clock to the incoming MADI signal.
• In configurations where more than two digital devices are being connected, distributed word clock should always be used. In
these types of more complex configurations, use dedicated, “distributed” word clock connections from the master (or
“house”) clock source to each device. For more information, see
Using a Distributed External Master Clock to Synchro-
nize Multiple Devices.
This section shows the following example configurations:
•
Using Word Clock to Synchronize Two VENUE Systems Exchanging MADI (Non-I/O Sharing)
• Synchronizing Two VENUE Systems Exchanging MADI in I/O Sharing Configurations
• Using MADI Audio to Synchronize a Single External MADI Device to S6L
Not all devices support all of these synchronization methods, so you should consult the user guide for your MADI device in order
to determine its capabilities.
Using Word Clock to Synchronize Two VENUE Systems Exchanging MADI (Non-I/O Sharing)
When using MADI to or from two VENUE S6L systems that are not configured for I/O Sharing, one of the systems must provide
word clock to the other system. Once connected, the S6L system receiving word clock detects it automatically.
Do not attempt to sync an S6L system to incoming MADI from another S6L system; use word clock instead.
To synchronize two discrete (non-I/O Sharing) VENUE systems:
Connect the coaxial cable from the WORD CLOCK OUT port on one of the VENUE S6L systems to the WORD CLOCK IN
port on the other VENUE system.
The VENUE system receiving word clock auto-detects word clock and displays EXT in the Mode box on-screen.
Do not “daisy-chain” word clock among multiple devices. Use a distributed word clock configuration.
Connecting Work Clock between two independent (not I/O Sharing) VENUE S6L systems exchanging MADI via MADI-192 MADI Option
Cards (E6L 1 Word Clock Out, at left, to E6L 2 Word Clock In, at right)
Never connect word clock from one engine to the other when they are connected for I/O Sharing. If using an external word clock
to distribute master clock, always make sure that only one E6L engine's word clock input is connected to that external, distributed
word clock source. For more information, see
Important: Synchronization in Shared I/O Configurations.
IN
OUT
NETWORK
MASTER 1
WORD CLOCK
UTIL
EXPANSION
2
3
6
7
8
1
2
3
4
5
OKOK
A
B
AVB-192
ACT SIG ACT SIG
ACT SIG ACT SIG
A
B
MADI-192
SRC
IN OUT IN WC OUTOUT
IN
OUT
NETWORK
MASTER 1
WORD CLOCK
UTIL
EXPANSION
2
3
6
7
8
1
2
3
4
5
OKOK
A
B
AVB-192
ACT SIG ACT SIG
ACT SIG ACT SIG
A
B
MADI-192
SRC
IN OUT IN WC OUTOUT
Word clock
MADI (coaxial)
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