Phoenix Gold ATI400, 6.5 "(16.5cm), 2-Way Ceiling Speaker, 175 Watts, Impedance: 8 ohms Frequency response: 45Hz - 22kHz Sensitivity: 90dB @ 1W/1m 24dB crossover, Mica Filled Polypropylene membrane, Improved bi-radial tweeter, Quantity: 1 pair Length x width x depth: 12 x 8.5 x 3.5 inch (31 x 22 x 9cm) Cutting: 7.5 x 10 inch (18.8 cm x 26.2 cm)