Kicker 43DSC404 - DS Series 4" Coax - DSC40 4-Inch (100mm) Coaxial Speakers, 4-Ohm A drop-in coaxial upgrade with the flexibility to fit nearly any vehicles doors for a vast improvement over factory sound. DS Series 4" Coax The DS Four-Inch Coaxial Speakers are a perfect upgrade for great sound in your car doors. Using zero protrusion PEI tweeters ensures you get every bit of clarity you need, without interfering with factory grilles. A stamped steel framework supports a ribbed, UV-treated foam surround and rigid polypropylene cone with EVC™ (Extended Voice Coil) technology, for the best sonic quality. These DS speakers work best with 30 watts of recommended power. See below for more details. Specifications Model DSC40 Speaker Design 2 - Way Woofer [in, mm] 4, 100 Mid [in, mm] n/a Tweeter [in, mm] 1/2, 13 Rated Impedance [Ω] 4 Peak Power Handling [Watts] 120 Continuous Power Handling [Watts RMS] 30 Sensitivity [1W, 1m] 88 Frequency Response [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 Material PEI (polyether imide) Tweeter Design Balanced dome Woofer Cone Material Polypropylene Woofer Surround Material Polyester foam