Pioneer TS-G1645R 6.5 inch (16 cm) 2-Way Speaker Size: 6.5 inch (16 cm) Max. Music Power Nominal: 250 W (40 W) Frequency Response: 26 Hz to 27 kHz Sensitivity (1W/1m): 89 dB Impedance: 4 Ohm, Cut-Out Dimensions: 128 mm