4" x 6" Yellow Injection-Molded Polymica Cone Woofer, Specially Treated Rubber Edge Suspension, Resists Moisture and Temperature Extremes, 40 oz. Magnet Structure, 1" High Temperature Aluminum Voice Coil, 1.75" Aluminum Film Midrange, 1" High Frequency Mylar Tweeter,160 Watts Rated Power. SPL: 89dB. Frequency Response:100Hz-18kHz, 4 Ohm Impedance, Mounting Depth:1.75",