Ceiling speaker with rear enclosure and power rating of 6 W (selectable to 3 and 1 W), 100 V line. 4" speaker. Frequency response of 150-18.000 Hz. Sensitivity 91 dB (1 W, 1 m and 1 kHz). Maximum sound pressure level 99 dB (6 W, 1 m and 1 kHz). Flush mounting, quick spring-type system. Dimensions 140 mm (Ø) x 90 mm (depth), ceiling mounting hole 125 mm Ø. ABS and metallic grille, white colour (RAL 9016).