Passive sealed in-ceiling baffle, designed for fixed installation, protective cover that allows this loudspeaker to be used in aseptic environment as well as dusty environments where complete driver sealing is required, 4” full-range woofer, RMS power: 7/3.5 /1.75W, constant voltage: 100/70V, frequency response: 180 Hz – 20 kHz (-10 dB), SPL: 88 dB, maximum SPL: 97 dB, coverage angle 1 kHz/4 kHz (-6 dB) : 140°/ 90°, made of steel and ABS plastic, dimensions: 142.5 x 121.5 mm, weight: 0.82 kg, fixing system: recessed in the ceiling, mounting hole Ø 125 mm.