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DIGI LOOP SETUP
The m905 features an AES and S/PDIF digital audio loop through output. This allows a digital source to
be looped through the m905 to another piece of equipment. The m905 provides several routing op-
tions for routing and format conversion on the digital loop through output. Digi-loop setup parameters
are as follows:
LOOP SOURCE -
This parameter selects the source for the AES and S/PDIF loop through outputs. Available
options are:
• off – digi loop is disabled
• follow dac input (DEFAULT) – the dac input source feeds the digi-loop output. For ADAT, the loop chan-
nels can be selected (see below). For ADAT and USB, the format can be selected (see below)
• TOSLINK – the TOSLINK input is always routed to the digi-loop output regardless of dac source
• S/PDIF – the S/PDIF input is always routed to the digi-loop output regardless of dac source
• AES1– the AES1 input is always routed to the digi-loop output regardless of dac source
• AES2 – the AES2 input is always routed to the digi-loop output regardless of dac source
ADAT LOOP CHANNELS -
This parameter allows the user to select what ADAT channels are looped to the
digi-loop output. Available options are ch:1-2, ch:3-4, ch:5-6, ch:7-8 and follow ADAT input. The default is
follow ADAT input.
ADAT/USB LOOP FORMAT -
When the loop source is ADAT or USB, the digital audio format on the digi-loop
output can be configured. Available options are consumer and professional. The default is professional.
DIGITAL INPUT SETUP
ADAT / AES DUALWIRE -
This parameter controls the system configuration to use either the ADAT input or
the AES DW input. Available options are:
• ADAT ACTIVE (DEFAULT) - the adat input is configured and available as a digital input source.*
• AES DUALWIRE ACTIVE - the aes dualwire input is configured and available as a digital input source.*
*In addition to the ADAT / AES DUALWIRE configuration in SETUP, hardware jumper J7 on the AT166 pcb
must be placed in the correct position for proper operation. The default position selects the ADAT input.
These jumpers are shown in the ‘m905 DIGITAL I/O PCB Jumper Locations’ diagram, page 40.
To set the ADAT/AES Dual Wire mode:
• Disconnect the m905 from its AC power by unplugging the AC power cable.
• Use a #2 Phillips screwdriver to remove the top cover from the m905. There are 8 screws to remove on the
top cover, 4 on the top and 2 on each side.
• Be careful to discharge any static electricity on the outside of the chassis before touching any of the jump-
ers inside the m905.
• Refer to ‘m905 DIGITAL I/O PCB Jumper Locations’ diagram, page 40.
SYSTEM SETUP
RCU FIRMWARE VER. -
This is a read-only parameter that indicates the current firmware revision of the m905
RCU. Attempts to edit this parameter will be ignored.