I’m trialling HQPlayer and getting it to work with Roon. But I keep getting some crackling (is this what clipping sounds like?? Never experienced it before) despite changing filters.
If the “Limited” counter increments, you know there is some clipping. But looking at your source format, you seem to have some DSP enabled in Roon which may be root cause. I strongly recommend to setup all parametric EQ and other DSP in HQPlayer and disable all such at Roon side.
Then show us what the HQPlayer “Plot” for the parametric EQ looks like?
Please check that your DAC is not macOS default audio output device. For example set the built-in audio as default for macOS.
Also please check that your DAC is disabled in Roon Settings → Audio as documented on last bullet point here (having your DAC still enabled in Roon is most common source of problems):