Apogee Symphony I/O - Configuring Digital I;O Formats; Calibrating Symphony I;O

Configuring Digital I/O Formats
Setting the Optical I/O Format
When using an optical I/O Module, set the format of the optical inputs and outputs to
either ADAT-SMUX or S/PDIF using the Optical Format drop down menu, found on the
Device Settings tab. The following format selections are available:
ADAT - This format transmits 8 channels of digital audio over one Toslink (optical)
cable at sample rates of 44.1 to 48 kHz. The ADAT format, originally found on Alesis
ADAT digital recorders, is found on a wide array of digital devices such as keyboards,
audio PCI cards and audio interfaces.
!
SMUX - This format transmits 8 channels of digital audio over 2 Toslink cables at
sample rates of 88.2kHz to 96kHz. The SMUX format,an extension of the ADAT format,
allows the transmission of digital audio data at higher sample rates.
!
S/PDIF - This format transmits 2 channels of digital audio over 1 Toslink cable at
sample rates of 44.1kHz to 96kHz. S/PDIF optical format connections are often found
on keyboards, CD players and other consumer audio devices.
!
Using the S/PDIF Coax I/O
The S/PDIF Coax format transmits 2 channels of digital audio over 1 coaxial cable at
sample rates of 44.1 to 192 kHz. S/PDIF Coax format connections are found on audio
PCI cards, audio interfaces, digital effects units and CD players.
!
S/PDIF Coax Input
Symphony I/O’s internal architecture employs 16 channels of input and output per I/O
Module. Since the S/PDIF Coax Inputs are the 17th and 18th inputs, it’s necessary to
replace a stereo pair of analog or digital inputs with the S/PDIF Coax Input in order for
the S/PDIF Coax Input to appear on the Routing tab grid. Use the S/PDIF Coax
Replaces drop down menu, in Maestro's Input tab, to select the analog or digital input
pair to be replaced by the S/PDIF Coax Input pair.
S/PDIF Coax Output
The S/PDIF Coax Output is "tapped" from one of the other analog or digital stereo
output pairs. Use the S/PDIF Coax Mirrors drop down menu, in Maestro's Output tab,
to choose which analog or digital stereo output pair will be duplicated on the S/PDIF
Coax Output.
Calibrating Symphony I/O
Symphony I/O’s A/D and D/A converters may be calibrated to operate at optimum
levels with a wide variety of analog gear. The calibration process is performed in the
following three steps:
1. Choose Analog Input and Output Reference Levels
2. Choose Digital Input and Output Reference Levels