There were two potential disappointments about the Sonos Arc Ultra, but that weren't explicit from Sonos' information and specs, so we also asked to confirm that a) it only has one HDMI eARC port, and no passthrough, and b) that there is still no DTS support.

With 15 amps and a new type of driver for low frequency sounds, the Sonos Arc Ultra might be the company's first soundbar that doesn't need a subwoofer.

Sonos unveils the Arc Ultra soundbar and Sub 4 subwoofer, featuring innovative Sound Motion technology and improved designs.

The Arc Ultra's 9.1.4 channel configuration, compared to the Arc's 5.0.2, suggests a more expansive soundstage and potentially more precise spatial audio. The new Sound Motion woofer also promises up to twice the bass of the original Arc, which could result in a more impactful low-end performance.