1.25
Operation Manual
© 2013 Prism Media Products Ltd
Revision 1.00Prism Sound Lyra
It is also possible to assign a level control to any desired outputs, primarily for use as a monitor
volume control - this is described in the Assignable level control section below.
Setting of analogue output levels, as well as activation of output mixers and assignment of the level
control are all managed in the Outputs tab of the Lyra Control Panel app.
5.1.4 Digital outputs
TOSLINK and RCA connectors output two-channel digital audio in the S/PDIF format at any standard
sample rate between 44.1kHz and 192kHz. The RCA output can also output digital audio in the
AES3 (AES/EBU) format using the RCA-XLR adapter supplied. To do this, select 'AES3' instead of
'S/PDIF' in the DO1/2 strip of the Outputs tab of the Lyra Control Panel app. This causes the carrier
voltage to be increased to the AES3 level, and the Channel Status to adopt the professional AES3
format instead of the consumer format of S/PDIF. Note that RCA connectors are only fitted to Lyra 2.
In Lyra 2, the TOSLINK connector can alternatively output 8-channel digital audio in ADAT format (at
44.1kHz or 48kHz sample rates) or 4-channel audio in ADAT SMUX format (at 88.2kHz or 96kHz
sample rates).
Note that ADAT input and output is only possible when operating Lyra 2 in one of its specific
ADAT-capable modes. This is to reduce overhead on the host PC or Mac when ADAT input and
output is not required. For more information see the Unit Settings tab of the Lyra Control Panel app.
It is possible to perform sample-rate conversion and word-length reduction (dithering or
noise-shaping to 16-bits) on the S/PDIF digital outputs as described in the following sections.
In normal operation, the S/PDIF digital outputs are fed directly with individual signals from the host
PC or Mac; however, it is possible to feed the outputs from local digital mixers within the Lyra
hardware if desired - this is described in the Output mixers section. Outputs may also be switched to
follow the mixers of other outputs.
It is also possible to assign a level control to the S/PDIF outputs, primarily for use as a monitor
volume control - this is described in the Assignable level control section below.
Activation of output mixers and assignment of the level control are all managed in the Outputs tab of
the Lyra Control Panel app.
5.1.4.1 Sample-rate converter
In Lyra 2 only, a two-channel sample-rate converter (SRC) can be activated in the S/PDIF output if
desired. This provides very high-quality conversion of the output signal from Lyra's current sample
rate to any standard rate between 44.1kHz and 192kHz. The SRC is selected in the Unit Settings
tab of the Lyra Control Panel app. Note that the SRC can be configured in the S/PDIF input, or in the
S/PDIF output, but not in both simultaneously.
When using an SRC in the S/PDIF output, it is necessary to select a synchronization source and
sample rate for the converted output. The sync source can be local, DI (the S/PDIF input) or the
Wordclock input. These settings are made in the Outputs tab of the Lyra Control Panel app.
Note that presence of an SRC in the S/PDIF output is shown by an indicator beneath the digital
meter on the unit's front panel (providing that the unit's meters are in Output mode).
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