The passive JBL Professional 5749 Subwoofer is the bass module used in the 5742 ScreenArray Cinema Loudspeaker System, which provides superior coverage, maximum power handling, and uniform acoustic power output, along with extremely low distortion. The low-frequency enclosure features two 18" Super Vented Gap Cooled (SVG) woofers. The shallow 24" profile of the JBL 5749 is ideal for minimum behind-screen depth requirements.