Original CDSD? If it's non-SE but has a USB port, it can be upgraded to CDSD SE by downloading the latest firmware. According to EMM, the latest CDSD firmware provides advantages when the CDSD is used in combination with the SE-version DAC.
If you are interested in upgrading the CDSD, I recommend asking EMM whether it still can be done. They stopped taking requests for DAC6 and DCC2 upgrades in April, according to their web site.
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