Newly redesigned and Hi-Res Audio Certified, the Next-Generation S-Series S2-S68 15cm x 20cm (6" x 8") Coaxial Speakers offer a new standard in entry-level sound performance. We packed supreme capability into these speakers by using highly effective materials and proprietary design elements. The lightweight woofer cone, crafted from a combination of polypropylene, glass fiber, and mica materials, serves up the essential high output / low distortion sound required for High-Res Audio performance. Alpine S-Series speakers feature increased magnet sizes for more power handling and best mid-bass performance in their category. The woofer's High Amplitude Multi-Roll (HAMR) surround brings out the best in bass by allowing maximum cone movement. A 2.5cm (1") dome tweeter serves up all the high-frequency detail you've been missing with your factory speakers. Specifications: Woofer Size: 15cm x 20cm (6" x 8”) Integrated 2.5cm (1“) Tweeters (Coaxial) Hi-Res Audio Certified (up to 40kHz) Poly Propylene, Glass Fiber, and Mica Cone Material Lightweight Design with High Output and Low Distortion High-Amplitude Multi-Roll (HAMR) Surround Peak Power: 230 Watts RMS Power: 75 Watts Cutout Diameter: 12.6cm x 18.3cm Mounting Depth: 6.1cm Mounting Height: 10.2mm Magnet: 90.0mm Frequency Range: 75 Hz - 40 kHz (Hi-Res Audio Certified) Impedance: 4 Ohms Sensitivity: 88 dB/W