Sound Storm Laboratories Fs8 8-Inch Single 4-Ohm Voice Coil 250-Watt Subwoofer peak power handling 250Wmagnet structure 30 Oz. Efficiency 1W/1M	90dBImpedance 	4 ohm Frequency Response: 40Hz-3kHzMounting Depth: 3-1/2" peak power handling 250W magnet structure 30 Oz. efficiency 1W/1M 90dB frequency response 40Hz-3kHz mounting depth 3-1/2"