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Nebula X1 Pro features one standard HDMI port. 

X1 Pro features one standard HDMI port. The projector comes with an advanced built-in 7.1.4-channel audio system capable of independently processing high-quality audio (e.g., Dolby Atmos), eliminating the need for external audio devices (like AVRs or game consoles). Crucially, eARC functionality is integrated into the main control system via a dedicated audio decoding chip (e.g., a multi-channel Atmos chip). This ensures system stability, reliability, and ease of use—users enjoy immersive sound without extra cabling. The X1 Pro’s integrated design simplifies setups.

That said, your proposed setup with an Apple TV connected via HDMI to an AV receiver for audio processing and then feeding video‑only HDMI to the X1 Pro works perfectly fine. You can absolutely configure it this way if you prefer external audio processing.

If you have any other questions, please don't hesitate to contact Nebula Customer Support at service@soundcore.com  for further assistance.