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Infinity designed and built their Kappa Series speakers, including the Kappa 463XF 4"x6" two-way car speakers, for refined audio quality. These speakers utilize Infinity's proprietary technology and premium materials. Its lightweight nature also means it doesn't require excessive power to drive. The Kappa 463XF speakers incorporate edge-driven, silk dome tweeters designed for a smoother, more open response with minimal distortion, even at high volumes. These tweeters feature a level control button, allowing you to adjust their brightness to your preference. The plate design separates the woofer and tweeter, offering the sonic advantages of component speakers in a coaxial format for easier installation. With an impedance of 3 ohms and an ultra-high sensitivity of 93 dB, these speakers can be powered by a factory radio or aftermarket stereo. For optimal performance, an outboard amplifier is recommended to safely take advantage of every watt of power. The frequency response ranges from 75 Hz to 40,000 Hz, ensuring detailed sound reproduction across a wide spectrum. Grilles are not included, as factory grilles are generally suitable for most applications.