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The 18W/8545K is a 7" mid/woofer designed with the patented SD-1 magnet system reduces clipping distortion generated as the drive unit exceeds its maximum linear excursion. The carbon fibre filled paper cone is impregnated and coated to damp resonance normally associated with stiff cones. The low loss linear suspension, especially the rubber surround, combines dynamic linearity with low coloration. The "K" version uses a non-conducting Kapton voice coil former. This improves the resolution in the bass/mid area. * Power handling: 100 watts RMS/140 watts max * Voice coil diameter: 1-5/8" * Voice coil inductance: .4 mH * DC resistance: 5.5 ohms * Frequency response: 28-3,000 Hz * Fs: 28 Hz * SPL: 87.5 dB 2.83V/1m * Vas: 1.7 cu. ft. * Qms: 5.2 * Qes: .30 * Qts: .28 * Xmax: 6.5mm * Net weight: 5.3 lbs. * Dimensions: Overall Diameter: 7", Cutout Diameter: 6-1/4", Mounting Depth: 3-1/8", Magnet Diameter: 4-3/4 ".