1.24
Operation Manual
© 2013 Prism Media Products Ltd
Revision 1.00Prism Sound Lyra
also shown beneath the digital meter on the unit's front panel (providing that the unit's meters are in
Input mode).
In Lyra 2, the TOSLINK connector can also accept 8-channel digital input in ADAT format (at
44.1kHz or 48kHz sample rates) or 4-channel input in ADAT SMUX format (at 88.2kHz or 96kHz
sample rates). the Inputs tab also contains UNL and ASNC indicators for the ADAT/SMUX input
function.
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 configure a sample-rate converter in the S/PDIF input, as described in the following
section.
5.1.2.1 Sample-rate converter
A two-channel sample-rate converter (SRC) can be activated in the S/PDIF input if desired. This
provides very high-quality conversion of any incoming digital audio signal to Lyra's current sample
rate. 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 in the case of Lyra 2, but not in both
simultaneously.
Note that presence of an SRC in the S/PDIF input is shown by an indicator beneath the digital meter
on the unit's front panel (providing that the unit's meters are in Input mode).
5.1.2.2 DI synchronization
Note that it is necessary to ensure that the sample clock of any digital audio input is synchronous
with Lyra's sample clock (unless the SRC is active in the digital input path). This can be achieved
either by synchronizing Lyra to the source (by using DI or ADAT sync source), or by synchronizing
the source to Lyra's S/PDIF, ADAT or Wordclock output. Lyra 2 also has a Wordclock sync input for
synchronization to Wordclock-equipped sources or house syncs.
The Input Settings tab of the Lyra Control Panel app contains indicators to show that the S/PDIF or
ADAT input is ASNChronous (i.e. there is an S/PDIF or ADAT signal present but it is not
synchronous with Lyra's sample clock).
For more information about synchronization settings, see the Synchronization section and also the
section describing the Unit Settings tab of the Lyra Control Panel app.
5.1.3 Analogue outputs
Lyra provides four analogue output channels (two in Lyra 1) on TRS jacks, with dual switchable
output level to allow connection to professional or consumer line-level equipment. The '+4dBu'
setting produces professional signals with a nominal level of +4dBu and allows a maximum level of
+18dBu (0dBFS). The '-10dBV' setting provides consumer signals with a nominal level of -10dBV
and allows a maximum level of +6dBu (0dBFS). Connection to unbalanced equipment is
automatically accommodated by a level-compensation 'bootstrapping' circuit.
In normal operation, the analogue 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 below. Outputs may also be switched to
follow the mixers of other outputs.
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