Pioneer 15" 100 watt woofer manufactured using copper wire on aluminum bobbins bonded with high temperature polyamide-imide adhesive, barium ferrite magnets and long throw voice coils. 100 watts (maximum 200 watts). 20-3000 Hz. 40 oz magnet. 20 Hz resonant frequency. 8 ohm impedance. 6.5 ohm DC resistance. 77 gram moving mass. 2" voice coil diameter. SPL: 96 dB 1W/1m. 14.61" mounting center. 15.3" x 13.9" x 6.5" MF051