Yes – the DAC clocking appears to be fixed to 48kHz on the M1001 – here’s the thread…
To save you reading all 14 pages, the M1001 uses an internal sample rate conversion algorithm. Depending on what they play, how they listen, and maybe on what they paid for their hi-fi, some folks can hear some low-level artefacts from this process. To present some kind of balance, there are many other users of the M1001 hardware that do not hear it. I have M1000 and M2000 and so I am also unable to hear it, but given how I listen I probably would if it was there.