The JBL CSS8004 is a professional-quality 4" in-ceiling speaker that provides full, clear audio in an unobtrusive design. The speaker has a wide 175deg. coverage pattern to reach a large area. It also has a 5W multi-tap transformer that supports 25, 70 and 100V distributed lines for connecting to virtually any pro sound system. This speaker fits the CSS-BB4 backcan (sold separately) for in-ceiling installations.