BOSS Audio Systems CH6940 Chaos Exxtreme Series 6 x 9 Inch Car Door Speakers - 500 Watts Max (per pair), Coaxial, 4 Way, Full Range, 4 Ohms, Sold in Pairs, Bocinas Para Carro Dimensions: 9 x 6.7 x 2.9 inches, Impedance: 4 ohms Mounting Depth: 2.1 inches, Mounting Hole: 7.1 inches Item Weight: 2.7 Lbs. (pair), Frequency Response: 100 Hz to 18 KHz Sensitivity: 90 dB @ 1 watt/1 meter, Poly Injection Cone, Rubber Surround, Stamped Basket, 1 Inch Voice Coil, 1 inch Polyimide Tweeter BOSS Audio Systems provides a powerful 3-year platinum online dealer warranty so long as the purchase is made through Amazon.com. We strongly encourage professional installation of this product to ensure proper and safe functionality