I used Sonos’s new home theater feature once, and knew it would be a competition killer

Sonos’s portable surrounds feature is now available in a software and firmware update. Compatible portable speakers can now act as home theater rear speakers. This feature allows select Sonos portable speakers to have several different uses. Sonos’s September launch event brought two new devices — and several upgrades — to the Sonos operating system, including an AI-powered upgrade to its voice assistant and new ways for existing devices to communicate with each other. Sure, custom AI agents and seamless switching between headphones and speakers are exciting, but Sonos’s portable surrounds feature is easily the coolest, most forward-thinking home theater feature I’ve seen in a…