The Sonos Refurbished Sub 4 delivers the room-filling, high-fidelity audio quality that has made Sonos the world's premier multi-room wireless audio brand, designed to integrate seamlessly into any Sonos system for synchronised whole-home or zone-based sound control from the Sonos app. 1% for the Planet certified refurbished Sub 4. 1-yr warranty.. Supports streaming from all major services including Spotify, Apple Music, Tidal, and Deezer, and connects via AirPlay 2 for direct streaming from any Apple device. Whether used as a standalone speaker or grouped with other Sonos products, it maintains the consistent Sonos audio standard and simple, elegant user experience the brand is built on.