I have run three two-chassis digital sources, and I own two now. If you mean vibration isolation, IME you are quite right, it affects the sound of the transport more than that of the DAC. However this has not been invariably true when it comes to electrical isolation. Some report the DAC responds better to premium power cords and other measures directed to the AC supply. IME again, it has turned out to be about equal: in some setups the transport likes clean AC better, in others it's the DAC.
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