Matching Products JBL CSS8004Ceiling loudspeaker with 4" chassis, 15 watts, 90 dB SPL and 175° dispersion angle for installation in ceilings up to a height of approx. 3 m. JBL CSS8008Ceiling loudspeaker with 8" chassis, 15 Watt, 96 dB SPL and 120° dispersion angle for installation in ceilings up to a height of approx. 3.50 m. JBL CSS8018Ceiling loudspeaker with 8" chassis, 20 watts, 97 dB SPL and 110° dispersion angle for installation in ceilings up to approx. 3.50 m high.