Bass you can feel! Pulse-pounding power. Soul-shaking sound. Sonos Sub 4. Sub 4 unlocks the full power of Sonos sound. Pair this subwoofer with your Sonos soundbar or speaker for pulse-pounding bass that immerses you even deeper in movies, TV, and music. Updated with a matte finish, the iconic design features dual force-canceling woofers that virtually eliminate distortion.