Why get a separate DAC
It’s said, digital cd transports and separate dacs, are at a disadvantage as each have their own clock (and are not syc’d together).
With a combined one box cd player there is one clock and both transport section and dac run off it (and are syc’d together).
There are some very expensive separate transport/dacs EG: DCS, Wadia etc etc that had a separate connection lead that let the transport run off the same clock as the dac, and not it’s own.
Cheers George