3635 18" Compact Cinema Subwoofer 225W BlackThe JBL 3635 Cinema Subwoofer provides natural low frequency sound quality for music and dialog in small cinema applications. Enclosure design is shallow in depth (14. 5 inches), to increase placement flexibility and minimize behind screen space requirements. The single 2042H 460 mm (18 inch) LF driver provides exceptional low frequency augmentation for small cinemas desiring to use the subwoofer channel, but whose budgets could previously not support