Specifications

1.31

Operation Manual

Revision 1.05Prism Sound Orpheus

· Mic/line input combos 1-4: XLR for microphones, with 10dB to 65dB finely-adjustable gain and

switchable phantom power; TRS jack for line inputs, with switchable +4dBu/-10dBV level, can

operate in balanced or unbalanced mode. See Analogue inputs.

5.4.1 Fuses and ratings

TO PREVENT SHOCK HAZARD, THE ORPHEUS HARDWARE SHOULD ONLY BE

OPENED BY QUALIFIED PERSONNEL. REMOVE THE POWER LEAD FROM THE

UNIT BEFORE REMOVING THE TOP COVER.

Fuse locations and ratings are as follows:

FUNCTION

LOCATION

TYPE

Mains

Rear panel

500mA(T), 20mm, glass

Note that no fuses or any other user-serviceable parts or options are located inside the

Orpheus unit.

5.5 Stand-alone operation

It is possible to operate Orpheus without a FireWire connection to a host computer. This is done by

setting up the unit as required using the Orpheus Control Panel applet whilst it is connected to a host

computer via its FireWire interface, then placing the unit in standby by pressing the standby button,

before disconnecting the unit from the host and power source. When the unit is re-powered, and

detects that no FireWire connection is active, it reloads the settings which were previously stored.

Since all of the outputs have optional mixers within the Orpheus hardware whose inputs include all of

Orpheus' input connectors, it is possible, for example, to connect the digital input pair to one or more

analogue output pairs, and to mix one or more analogue input pairs to the digital output pair. The

synchronization source and sample rate can be set in the usual way. Thus stand-alone mode can be

used to configure a stand-alone D/A converter and A/D converter, with static mixing if required.

ADAT Direct mode

ADAT Direct mode allows Orpheus to operate as an eight channel analogue-to-ADAT and

ADAT-to-analogue converter. ADAT Direct mode is activated by setting the ADAT control in the Unit

Settings panel to 'Direct'.

In ADAT Direct mode it is possible to control Orpheus using the Control Panel applet in the usual way

while Orpheus is connected to a host computer via FireWire. If Orpheus is not connected to a host

computer, ADAT Direct mode can still be used as a stand-alone mode, by saving pre-selected

settings using the standby button as described above.

Signal routing in ADAT Direct mode

The eight ADAT output (send) channels are fed directly from the eight analogue input channels. Any

signals sent from the host computer over FireWire (if connected) destined for the ADAT outputs are

ignored by Orpheus.

The eight channels sent from the host computer over FireWire (if connected) destined for the

Orpheus analogue outputs are ignored by Orpheus, and replaced by the eight ADAT input (return)

channels. This means that the analogue output DAW/Mix switch can still be used: in the DAW