SSL F341 FORCE 400-watt 3 way auto 4" x 10" Coaxial Speaker 4" x 10" 3-Way Speaker, 400 Watts, Poly injection Conepeak power handling 400Wmagnet structure 20 Oz. efficiency 1W/1M 90dBimpedance 4 ohm frequency response 100Hz-18kHzmounting depth: 2-7/16 Poly Injection Cone peak power handling 400W magnet structure 20 Oz. frequency response 100Hz-18kHz mounting depth 2-7/16"