A standard, pre-ARC HDMI port, in contrast, only supports video and audio transmitted from a source device directly to a TV or another type of display. The biggest practical application of ARC is ...

However, most TVs only feature one solitary HDMI port marked with 'ARC', so you'll need to ensure you use that port to connect devices with an HDMI cable, otherwise it won't work properly.

In 2017, HDMI 2.1 introduced eARC, which added support for high-end surround sound such as Dolby Atmos and DTS:X. eARC also supports variable refresh rate (VRR), quick media switching (QMS ...

This was a bugbear with the earlier Sonos Arc and it was widely expected the Ultra would 'fix' this – but, alas, it wasn't to be. If you know the single HDMI port is perfectly fine for your ...