staticV3
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The WiiM Ultra's HDMI input is an ARC input, whereas the ATV's HDMI is just regular HDMI.Anyone here tried Apple TV hdmi into Wiim ultra for Apple Music lossless.
Therefore,
ATV->HDMI->WiiM Ultra
would not work.What would work is
ATV->HDMI->TV/AVR->HDMI(ARC)->WiiM Ultra
This is the intended way to use the WiiM Ultra's HDMI input, however, the TV or AVR will most likely resample the audio to 48kHz before sending it out via ARC.
For best signal fidelity out of the ATV, I would do
ATV->HDMI->HDMI Audio Extractor->Toslink->WiiM Ultra
, plus ATV->HDMI->HDMI Audio Extractor->HDMI->TV
for the image.Here's a test of one such HDMI extractor:

Amazon Basics 4K HDMI Extractor Review
This is a review and detailed measurements of the Amazon Basics 4K HDMI extractor. Member kindly purchased and drop shipped it to me. It normally costs $22.89 but was on sale for just $5!!! The case is the standard metal one for these kinds of adapters. Power is provided with a supplied USB-A...

These tend to have rather crummy DACs built-in, but if you use the digital outputs, they're bit-perfect.
See the last graph (DAC is bypassed).