Most car audio system designs call for 2- or 4-ohm impedance. Kappa Series subwoofers put the choice in your hands. The Kappa Series voice coil employs a two-sided, ducted airflow design that cools the voice coil, increases power handling and improves reliability. Kappa subwoofer cones incorporate glass-fibers for exceptional accuracy and detail. Inherently non-resonant, the glass-fiber cones eliminate distortion so your music—and nothing but your music—comes through loud and clear. The terminals on the Kappa subwoofers accommodate up to 8-guage wire (8.37mm 2 cross section), which transfers low-resistance, low-loss power to the woofer, even over long wire runs.