TOA PC-2852 15Watt Ceiling Speaker Rated Input        15 W (100 V, 70 V line) Rated Impedance            100 V line: 670 Ω (15 W), 1 kΩ (10 W), 2 kΩ (5 W), 3.3 kΩ (3 W) 70 V line: 330 Ω (15 W), 670 Ω (7.5 W), 1 kΩ (5 W), 2 kΩ (2.5 W), 3.3 kΩ (1.5 W) Sensitivity :  96 dB (1 W, 1 m) (500 Hz – 5 kHz, pink noise) Frequency Response     45 Hz – 20 kHz (peak -20 dB) Speaker Component      20 cm (8″) coaxial cone-type Dimensions for Fixing Hole          Mounting hole: φ250±3 mm (φ9.84″±0.12″) Ceiling thickness: 5 – 25 mm (0.2″ – 0.98″) Speaker Mounting Method         Spring clamp Applicable Cable               600 V vinyl-insulated cable (IV wire or HIV wire) Solid copper wire: φ0.8 – φ1.6 mm (equivalent to AWG 20 – 14) 7-core twisted copper wire: 0.75 – 1.25 m㎡ (equivalent to AWG 18 – 16) Connection         Push-in connector (bridging terminal-2 branch type) Finish    Baffle: Steel plate, white (RAL 9016 equivalent), paint Grille: Surface-treated steel plate net, white (RAL 9016 equivalent), paint Dimensions        φ280 × 92 (D) mm (φ11.02″ × 3.62″) Weight 1.6 kg (3.53 lb) Accessory            Paper pattern …1 Integrated with a speaker unit and panel, the PC-2852 Ceiling Mount Speaker is of all metallic construction and ideal for use in a voice alarm system. It feature spring clamp mechanism for easy speaker mounting to the ceiling. The input impedance can be easily changed by changing the tap position of the transformer. The push-in type input terminal block makes cable connections easy and allows bridge wiring.