jbl synthesis ssw 3JBL Synthesis SSW 3 In wall subwoofer for home theater with deep and controlled bass JBL Synthesis SSW 3 is a passive in wall subwoofer developed for home theaters where you want powerful low end without visible speakers. It installs directly into the wall and gives you a solution that combines discreet integration with bass reproduction that can be felt throughout the room. With dual 10 drivers and solid construction, you get a subwoofer that works