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The CS Series delivers remarkable performance and ultra-clean bass, utilizing a heavy-duty motor/magnet structure featuring EVC (Extended Voice Coil) technology not found in stock speakers. They use polypropylene cones with tough, ribbed, UV-treated surrounds for precise linear excursion and reliability. The CS 5-1/4-Inch Coaxial Speakers are an excellent upgrade from factory speakers.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 75 watts of recommended power. Features: Pair KICKER 43CSC54 5.25" 450 Watt 4-Ohm 2-Way Car Audio Coaxial Speakers Speaker Design: 2 - wayWoofer Size: 5 1/4 in. (130 mm)Tweeter Size: 1/2 in. (13 mm)DC Resistance: 3.4 ohmsPeak Power: 225 Watts per speaker / 450 Watts per pairContinuous Power (RMS): 75 Watts per speaker / 150 Watts per pairSensitivity: 90 dB @ 1W, 1mEffective Frequency Range: 45Hz - 20kHzMounting Hole Diameter: 4 1/2 in. (115 mm)Top Mount Depth: 1/4 in. (7 mm)Bottom Mount Depth: 1 3/4 in. (45 mm)Grilles: YesTweeter Magnet Material: NeodymiumTweeter Dome Material: PEI (polyether imide)Tweeter Design: Balanced domeWoofer Cone Material: PolypropyleneWoofer Surround Material: Polyester foam