An FCC filing points to new Sonos headphones coming soon

The FCC filing reveals the model number S52A for a new Sonos wireless headphone set and includes an oval diagram labeled Sonos Ace Ultra, suggesting a successor to the original Ace. It also lists five color finishes that go beyond the white and black offered on the first model. These details point to a refreshed product line that follows Sonos existing naming convention for its Ultra variants.

Among the submitted documents is evidence of testing for local network operation on both the 2.4 GHz and 5 GHz bands. This could be intended for the same TV swapping feature present on the current Ace, or it might enable music streaming over Wi-Fi similar to how Sonos speakers operate. The presence of dual-band testing hints at a potential shift from Bluetooth-only connectivity.

The original Sonos Ace launch was affected by a problematic app rollout that hindered ecosystem integration, while the company has since released other well-received products such as the Arc Ultra soundbar and the Play speaker. The filing implies Sonos is applying lessons from that experience to avoid repeating past software issues.

For engineers, adding Wi-Fi audio streaming would mean adapting the audio pipeline to handle network latency, implementing robust reconnection logic, and ensuring compatibility with existing Sonos app and controller firmware. Adoption would also require validation across both frequency bands and verification that any new features do not break current Bluetooth functionality.

However, the filing does not confirm that Wi-Fi streaming will be included; it only shows testing activity. The final product may retain the Bluetooth-only approach of the Ace, and any new capabilities depend on Sonos completing software work and addressing the app reliability concerns that affected the earlier release.