CS Series CSC4 CS-Series 4-inch Coaxial Speakers deliver accuracy, durability and a factory fit! These coaxial speakers are a significant upgrade in your sound. A stamped-steel framework supports a rigid polypropylene cone with EVC™ (Extended Voice Coil) technology for the best sonic quality. Using zero-protrusion PEI tweeters ensures you get every bit of clarity you need, without interfering with factory grilles. These CS speakers work best with 50 watts of recommended power. See below for more details. Fits nearly every car made Zero-protrusion tweeters to fit nearly any factory depth Woofer EVC™ (Extended Voice Coil) tech assists with precise linear excursion UV-treated poly-foam surround resists heat or direct sunlight Large woofer magnet in a heavy-duty motor for ultra-clean bass PEI-tweeter construction provides superb clarity Neodymium tweeter magnets allow for increased volume in high frequencies Steel mesh grilles included for speaker protection Specifications Speaker Design 2 - way Woofer Size | in [mm] 4 [100] Tweeter Size | in [mm] 1/2 [13] DC Resistance | ohm 3.5 Peak Power | Watts 150 Continuous Power | Watts, RMS 50 Sensitivity [SPLo] | dB @ 1W, 1m 88 Effective Frequency Range | Hz 60-20k Mounting Hole Diameter | in [mm] 3 3/4 [95] Top Mount Depth | in [mm] 1/4 [6] Bottom Mount Depth | in [mm] 1 13/16 [46] Tweeter Protrusion | in [mm] 0 Grilles Yes Tweeter Magnet Material Neodymium Tweeter Dome Materia PEI [polyether imide Tweeter Design Balanced dome Woofer Cone Material Polypropylene Woofer Surround Material Polyester foam