BOSS Audio Systems NX694 Onyx Series 6 x 9 Inch Car Door Speakers - 800 Watts (per pair), Coaxial, 4 Way, Full Range 4 Ohms, Sold in Pairs, Bocinas Para Carro 4-Way System, Rubber Surround, Polypropylene Cone, Stamped Steel Basket 2.28" (58 mm) Midrange. 0.71" (18 mm) Dome Tweeters, Max Power: 800 W Nominal Impedance: 4 Ohms, Frequency Response: 45 Hz-20 kHz, System Sensitivity (1 W/1 m): 89 dB 6dB/Oct High-Pass Filter, Overall Diameter: 9.25" x 6.42" / 235 x 163 mm Installation Hole Diameter: 8.55" x 5.85" / 217 x 149 mm