Interestingly, my 889 on SPDIF will send up to 8 channels PCM (192khz 32bit), but the extractor only sends 2 channels (same spec), regardless of input.
On 889, and 8 channels, the unit (Z906) essentially turns off, 6 channels is played as 2, 8 from extractor results in 2 only.
Tested using WASAPI exclusive mode (no Interactive), and Potplayer.
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I clearly see the issue, In terms of audio, HDMI 2.0b-2.1 carries a max of 37mbps, the same for DisplayPort. However interestingly, modern Toslink supports all modern formats @125mpbs.
Based on 192khz, 32bit 8 channels @ ~51mbps, 125mpbs is almost enough for 20 channels @ 192khz 32 bit, or, roughly 108 channels @ 48khz 24bit (125 / 37 * 32).
The problem is, Toshiba did not add revision numbers to their modules (which vary in speed), Windows just see's SPDIF, and no revision to work with.
If Windows, or other hardware-software could detect the revision or specs of the SPDIF module, it would work like HDMI.
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DTS Settings, updated, added 2 personal configurations, one for HDMI-DP stereo (monitor, no digital), and the other for my HDMI extractor (multichannel with Interactive).
If you are using the HDMI-DP.reg settings, using 'FX Configurator', copy the key from SFX processing modes, to EFX processing modes (middle column).
Not all devices accept EFX processing, and may end up with no audio, reverse the change if so, else SU will fully unlock for you.
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