Orion XTR104S 10" Dual 4  XTR Series Car Subwoofer 10" Dual 4 Ohm XTR Series Subwoofer; Frequency response: 20-250 Hz; Sensitivity: 84 dB Power Handling: Peak: 500 watts; 	RMS: 250 watts ; Max Power: 2000 watts ; Impedance: 4 ohm Paper cone woofer. Oversize nitrile-butadiene rubber surround. Dual cooling system Tinsel leads stitched and looped across spider. Large ceramic magnet structure 2-1/2" Copper wound voice coil on aluminum former. Spring loaded push terminals