Description KICKER KS-Series Speakers let you play at concert-like volume, yet maintain the smoothness and subtlety to please even the most selective ear. The high-performance woofers utilize internally dampened polypropylene cones and tough rubber surrounds for outstanding midrange detail and pounding bass! All KS-Series woofers feature an ultra-slim mounting depth to easily fit in most factory speaker locations. The 51KSC3504 2-Way Coaxial Speaker System mounts effortlessly in select domestic and import models, thanks to an ultra-thin speaker design and internal crossover. The coaxial system combines easy installation and acoustic perfection to achieve Concert-Level realism and volume. Rugged 3.5" (89mm) Polypropolene Woofer/Midrange with tough Rubber Surround fits select GM, Ford, Chrysler, Jeep, Dodge and Imports. 1/2" (13mm) Neodymium Silk-Dome tweeters coaxially mounted for a smooth sound. Tweeter protrusion of 3/16" (4mm) above the speaker frame. Thin-mount design easily fits behind factory grilles; 1-5/8" (41.5mm) mounting depth. Grilles not included. Recommended Amplifier Power: 15 - 50 Watts RMS | Peak Power Handling: 100 Watts | Sensitivity: 88dB 1W/1M | Frequency Response: 80 Hz - 20 kHz | Nominal Impedance: 4-Ohms