Kicker KS-Series 2-Pack 51KSC6904 6x9" 4 Ohms 2-Way Coaxial Speakers - High Power Handling, Polypropylene Woofer, Tough Rubber Surrounds Experience concert-level audio performance with the KICKER KS-Series 51KSC69304 speakers. These speakers deliver powerful and clear sound at high volumes while maintaining smoothness and subtlety to satisfy even the most discerning listeners. The internally dampened polypropylene cones and durable rubber surrounds ensure precise midrange and midbass, while the high-quality silk-dome tweeters provide natural and detailed highs. Product Highlights: Condition: New Speaker Design: 2-Way Woofer Size: 6 x 9 inches (160 x 230 mm) Tweeter Size: 1 inch (25 mm) Rated Impedance: 4 ohms Recommended Amplifier Power: 15-150 Watts RMS Sensitivity: 92 dB (1W, 1m) Frequency Response: 30 Hz - 21 kHz Mounting Hole Diameter: 5-11/16 x 8-7/16 inches (144 x 215 mm) Top Mount Depth: 2-15/16 inches (75 mm) Bottom Mount Depth: 3-3/16 inches (81 mm) Tweeter Protrusion: 1/16 inch (1 mm) Grilles: Yes Tweeter Magnet Material: Neodymium Tweeter Dome Material: Silk Woofer Cone Material: Polypropylene Woofer Surround Material: Rubber