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17.4 USB
USB: interface mode.
This mode can be activated manually by selecting Basic Mode – USB. The device enters USB
mode automatically when Basic Mode is set to Auto and a USB connection is detected. USB has
priority over AD/DA mode.
In USB mode all inputs are routed to USB, all outputs are fed from USB. In SETUP – Options –
Device Mode / DSD – CC-Mode the unit can be configured as 2-channel (Stereo) or 6/8-channel
(Multi-channel) device. Sample rates higher than 192 kHz and DSD128/256 are only available in
2-channel mode, which is why this mode has been chosen as default.
17.4.1 Class Compliant Stereo mode
In 2 channel / Stereo mode only the analog inputs are sent as USB record signal, and the stereo
USB playback signal is available simultaneously at all analog and digital outputs.
The two block diagrams show the small differences between both modes.
USB Playback channels 3/4 can only be monitored in multi-channel mode. In stereo mode select-
ing USB 3/4 plays channels 1/2.
The option Digital Out Source - Main Out (SETUP – Options – Device Mode / DSD) sends the
processed signal Line Out 1/2 to the digital outputs AES, SPDIF and ADAT, for example to con-
nect active monitors having digital inputs.
User's Guide ADI-2/4 Pro SE - v 1.0
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