Because of licensing, when you pass high resolution audio streams from SACD through the coaxial output, it downsamples to 24-bit, 88.2 khz.
From the manual:
NOTE:
- Due to bandwidth limitations, high resolution audio formats such as Dolby Digital Plus, Dolby TrueHD, DTS-HD High Resolution and DTS-HD Master Audio cannot be sent through the coaxial or optical digital audio output. A reduced resolution version of the same audio track will be output instead. To listen to high resolution audio formats in their best quality, please use the HDMI connection if you have a receiver that handles HDMI audio (see page 11) or use the multi-channel analog outputs if you do not (see page 18).
- Due to copyright restrictions, SACD audio cannot be sent through the coaxial or optical digital audio output. To listen to SACDs, please use the HDMI or analog audio connections.
- Due to copyright restrictions and bandwidth limitations, full resolution audio from DVD-Audio discs cannot be sent through the coaxial or optical digital audio output. To listen to DVDAudio in full resolution, please use the HDMI or analog audio connections.
Have you compared using the Oppo's analog outputs vs. piping the data through coax to the Gumby? I use the 105 mostly for Netflix and regular CDs, but it would be nice to retain the flexibility for other formats. Otherwise, may as well sell the 105D and just get a 103 to use the coaxial output. I've just been so intrigued by what I've read about the Gumby and Yggy...