That’s what one would indeed expect if you read the marketing comms about the DD and indeed what one would conclude for the Quad USB module. One little problem though for the AES input: on the latest Premier version, the AES is fixed on the standard input/output module. So, the question is if the S/PDIF and AES inputs will be ”steered” by the DD throug the Pro-ISL link.
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I emailed MSB about this question. I’m loving my MSB Premier DAC. I use Renderer v2 for Roon, using a NUC running ROCK in the server room. (OK the upper shelf in my wife’s closet where the cable modem and router/switch are already) I also use TOSLink from my TV for video watching, and the RCA SPDIF for a Sonos Port input.
Back on track. All the fixed SPDIF inputs on the Premier DAC are disabled by the Premier Digital Director. I was told that the DD comes with the 2 optical modules that fill the slots open on the Premier DAC, and an SPDIF module to plug into the DD. When I order the DD (pending spousal approval) I’ll also get the Quad Rate USB for connection from a computer. That will leave one expansion slot open for any unexpected new modules such as an HDMI input, or the module I suggested to them: a phono input module. (RIAA circuit, then A2D to feed into the DAC)