Two-way ceiling loudspeaker (6.5 '' + tweeter), bass reflex, 30 W RMS power on 100 V line. Power selection 30, 15, 7.5 and 3.75 W. 8 ohm. Complies with the EN 54-24 and BS-5839 voice alarm standards, part 8. It incorporates a back box. Frequency response from 100 to 19,300 Hz. Sensitivity of 95.5 dB SPL at 1 kHz, 1 W and 1 m. Maximum acoustic pressure of 110.3 dB at 1 kHz and 1 m. ABS finish with metal grill, white RAL 9016 color. Dimensions Ø 239.5 x 141 (depth) mm. 208 mm Ø recessed hole.