DESCRIPTION TOA PC658R 6 WATT 6 INCH SINGLE CONE SPEAKER WITH METAL GRILLE AND SPRING CATCH MOUNTING Integrated with a resin panel and speaker frame, the PC-658R is the ceiling mount speaker with a metal attached. It features spring clamp mechanism for easy speaker mounting to the ceiling. The input impedance can be easily changed by changing thetap position of the transformer.  SPECIFICATION Rated Input 6 W (100 V line), 3 W (70 V line) Rated Impedance 100 V line: 1.7 kΩ (6 W), 3.3 kΩ (3 W), 10 kΩ (1 W) 70 V line: 1.7 kΩ (3 W), 3.3 kΩ (1.5 W),10 kΩ (0.5 W) Sensitivity 90 dB (1 W, 1 m) (500 Hz - 5 kHz, pink noise) Frequency Response 65 Hz - 18 kHz (peak -20 dB) Speaker Component 16 cm (6") cone-type Dimensions for Fixing Hole Mounting hole: Φ170±5 mm (Φ6.69"±0.2") Ceiling thickness: 5 - 25 mm (0.2" - 0.98") Speaker Mounting Method Spring clamp Finish Baffle: Polypropylene resin, white (RAL 9016 equivalent) Grille: Surface-treated steel plate net, white (RAL 9016 equivalent), paint Dimensions Φ192 à 73 (D) mm (Φ7.56" à 2.87") Weight 500 g (1.1 lb) Accessory Paper pattern ?1  Â