The SPDIF out receives the same signal as the main DAC. If DTS or Dolby digital is sent, this is not standard audio, and will cause the DAC to produce loud random noise. The SPDIF port will pass the signal unaltered. The necessary settings are inside the playback software (e.g. for J-River under “bit streaming”). It is NOT possible to send a separate audio signal to the DAC and DTS or Dolby digital to the SPDIF output.
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