MINI 3-inch Ceiling Speaker CLS-603. This compact speaker is designed for background music, public address, or multi-room audio systems in offices, hotels, retail spaces, and residential applications. Its low-profile design and clear sound performance make it ideal for discrete installation in suspended or false ceilings. Power Rating 3W / 5W Input Voltage 100V line Frequency Response 70 Hz – 12 kHz Sensitivity (1W/1m) 98 dB at 1 kHz Speaker Unit 3″ Woofer Overall Diameter Φ98 mm Cutout (Hole) Diameter Φ86 mm