The SSW-1 is a custom in-room/built-in subwoofer and is the flagship of the JBL Synthesis SSW subwoofer range. It features dual 15-inch (380mm) high-excursion cast-frame woofers in a heavily-braced, front-ported enclosure constructed from 1-inch MDF throughout. The SSW-1 delivers extreme low-frequency performance and high SPL output levels for custom installations in large to extra-large rooms.