K-Series components feature titanium coated polygraphite cones and 1" titanium neodymium tweeters for the perfect combination of stunning highs and powerful bass, even when you crank up the volume. The ribbed foam surround not only looks cool, they borrow technology from KICKER s Comp VR subwoofers to offer precise control during extreme cone excursion. KICKER K-Series components feature outboard 2-way phase/impedance corrected crossovers with built-in tweeter protection circuitry.- Titanium Finish Polygraphite Cones. - Polyester Ribbed Foam Surround. - 1" Titanium Neodymium Dome Tweeters. - 4,500 Hz Crossover Network (6 dB/octave low pass, 12 dB/octave high pass).