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USB OPERATION
USB AUDIO PLAYBACK
To playback music via the USB input and a connected computer, it is necessary to use a "media
player" such as JRiver, Foobar, etc. The USB input is capable of extremely high resolution audio, up
to 32 bit/ 384kHz PCM, or DSD up to 256. (iTunes nor Windows Media Player is capable of such
resolutions on their own). However, please know your media player software thoroughly to know
what its limitations may or may not be as it relates to setup, PCM resolutions, DSD capability and
supported file types.
Make sure drivers (PC) have been installed by following the instructions above, under USB
Requirements and Installation , then do as follows:
(1) If not already on, make sure the SI-300.2d is turned ON and connected to your computer
via a high quality USB cable, and then turn ON your PC or MAC.
a. MAC - Make sure "xCore USB Audio 2.0 Output" is selected in the MAC Sound
Preferences in the System Preferences Panel.
b. Windows PC - Make sure "XMOS XS1-U8 MFA is selected as the Playback
device under the Sound preferences in the Windows Control Panel.
(2) Select the USB input by pressing the USB input button on the front panel of the SI-300.2d
or pressing the USB button on the hand held remote. "USB" will appear on the display
screen.
(3) Open your media player software audio settings and make sure "TUSBAudioASIO Driver
(ASIO) is selected as the Audio or Output Device. If there is a separate Audio Output
Mode setting for you media player, select ASIO.
(4) Playback music through the media player software.
NOTE: Some media players have Smartphone and tablet Apps that allow you to control the PC or
MAC software via the Smartphone or tablet. Otherwise, all control must be done via the computer.
USB DSD PLAYBACK
This requires the media player to support native DSD or "DSD over PCM" (DoP). It is recommended
to use native DSD for PC (capable up to DSD256) and DoP for MAC (capable up to DoP128).
Therefore, it is necessary to check your media player settings to send either DSD or DoP depending
on your computer and media player. Upon playback, the display screen of the SI-300.2d will show
either DoP64, DoP128 (PC or MAC), or DSD64, DSD128, or DSD256 (PC Only).
For now, DSD playback on MAC is limited to DoP64 and DoP128. You may also need to set the MIDI
Audio of the MAC computer to 24 Bit.
(1) In Applications, open the Utilities folder.
(2) Open Audio MIDI Setup.
(3) Select the XCore Audio Output on the left panel.
(4) Next to Format, select the highest supported sample rate in the first dropdown box, and
Select 2ch-24bit Integer in the second dropdown box
NOTE: TruBit™ Upsampling Sample Rate Converter does NOT engage for the USB source. Since
USB playback is dependent on media player software of the PC or MAC, you must select any desired
upsampling within the chosen media player software itself.
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