Specifications

1.24

Operation Manual

Revision 1.05Prism Sound Orpheus

The Input Setup tab of the Orpheus Control Panel applet contains the control for selecting the RCA or

TOSLINK connector for S/PDIF input, and also an indicator to show that the S/PDIF input is

UNLocked (i.e. no S/PDIF carrier is recognized). The UNLock indicator is also shown beneath the

digital meter on the unit's front panel (providing that the unit's meters are in Input mode).

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 S/MUX format (at 88.2kHz or 96kHz sample rates).

Note that ADAT input and output is only possible when operating Orpheus 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 Orpheus Control Panel

applet.

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 Orpheus' current sample

rate. The SRC is selected in the Unit Settings tab of the Orpheus Control Panel applet. Note that the

SRC can be configured in the S/PDIF input, or in the S/PDIF output, 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

Orpheus' sample clock (unless the SRC is active in the digital input path). This can be achieved

either by synchronizing Orpheus to the source (by using DI or ADAT sync source), or by

synchronizing the source to Orpheus' S/PDIF, ADAT or Wordclock output. Orpheus also has a

Wordclock sync input for synchronization to Wordclock-equipped sources or house syncs.

The Input Settings tab of the Orpheus Control Panel applet contains an indicator to show that the

S/PDIF input is ASYNChronous (i.e. there is an S/PDIF signal present but it is not synchronous with

Orpheus' sample clock.

For more information about synchronization settings, see the Synchronization section and also the

section describing the Unit Settings tab of the Orpheus Control Panel applet.

5.1.3 Analogue outputs

Orpheus provides eight analogue output channels on TRS jacks, with dual switchable output level to

allow connection to professional or consumer line-level equipment. Connection to unbalanced

equipment is automatically accommodated by a level-compensation 'bootstrapping' circuit.

In normal operation, the eight 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 Orpheus

hardware if desired - this is described in the Output mixers section below.

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