SSL F240 FORCE 200-watt 2 way auto 4" Coaxial Speaker 4" 2-Way Speaker, 200 Watts, Poly injection Cone peak power handling 200Wmagnet structure 20 Oz. Efficiency 1W/1M 90dBimpedance 4 ohm frequency response 100Hz-18kHz Mounting depth: 1-3/4" Mounting Hole: 4" Diameter Poly Injection Cone peak power handling 200W magnet structure 20 Oz. frequency response 100Hz-18kHz mounting depth 1-11/16"