Sorry for keep on hijacking the men220 thread but as an electrical engineer, I understood nothing from vmax's explanation. Torodidal power supply has nothing to do with volume control and volume control done in digital domain isn't desired as it will reduce bits to reduce volume.
It loos like the lyngdorf tdai2200 has digital inputs and a single digital coax output. This could be potentially used as a digital loop through. It is unclear the unit outputs processed signal rather than a pass through.
Men220 could be modded for digital in and out. It would be an interesting project.
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