Emotiva XDA-2 User Manual page 15

XDA-2
4. Optical 1 and Optical 2 Toslink Optical S/PDIF Inputs
These inputs accept optical S/PDIF (Toslink) digital audio signals at sample rates up to
192k and bit depths up to 24 bits.
Note: The XDA-2 is a stereo PCM DAC and only accepts STEREO PCM digital audio
signals. The XDA-2 CANNOT decode Dolby Digital or DTS audio content. Be sure that
any equipment connected to these inputs is configured to output stereo PCM audio.
Note: The Toslink inputs on the XDA-2 can accept 192k sample rate data. However,
the Toslink outputs on some source devices are incapable of sending data at rates
above 96k, and some poor quality Toslink cables are unable to cleanly pass signals
above 96k.
5. Coaxial 1 and Coaxial 2 Coax Electrical S/PDIF Inputs
These inputs accept electrical S/PDIF digital audio signals at sample rates up to
192k and bit depths up to 24 bits.
Note: The XDA-2 is a stereo PCM DAC and only accepts STEREO PCM digital audio
signals. The XDA-2 CANNOT decode Dolby Digital or DTS audio content. Be sure that
any equipment connected to these inputs is configured to output stereo PCM audio.
6. USB Input
The USB input on the XDA-2 is used to connect the XDA-2 to a computer. When connected
to a computer, the XDA-2 will appear to the computer as a "USB sound card" or "USB audio
device", and you will be able to select it as an audio output device.
The XDA-2 is a "USB Audio Class 2 Device" and supports up to 192k sample rate and 24 bit
depth over USB. When using the XDA-2 with a Windows PC, you will need to install a (free)
driver on the PC. Some newer Apple computers, and some versions of Linux, may be able
to connect to the XDA-2 without a driver (if they have a USB Audio Class 2 driver built in).
Drivers, instructions for installing them, and details about the features supported by each,
will be available on the XDA-2 product page of our website.
Note: The USB port on the XDA-2 is intended for connecting the XDA-2 to a computer
as an "external sound card"; you cannot connect USB hard drives or thumb drives to
this port.
Note: "USB Audio Class 2" has nothing to do with "USB 2.0". It is a type of driver,
which is required to reliably support sample rates over 96k on USB audio devices.
Microsoft has chosen NOT to include this driver with Windows (so far), which is
why you are required to install a separate driver. Newer Apple computers, and some
Linux distributions, include this driver. Any operating system that includes support
for "USB Audio Class 2" will probably work with the XDA-2, as will some computer-
based media players (like the Logitech Squeezebox). See their documentation for
details.
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