The Skar Audio SDR-12 D4 12" Dual 4-ohm subwoofer was engineered to dish out reliable, hard hitting, and low spectrum sound. Featuring a high flux ferrite motor, This woofer will provide extreme power handling for extended periods of time. The SDR series will quickly become a customer favorite, as it's perfect for people just entering the world of car audio all the way up to seasoned pros. The SDR-12 Dual 4-ohm 12-inch car subwoofer features a 2.5” high temperature 4-layer high temperature copper voice coil that is attached to our Skar Audio signature red spider. The surround on the SDR series is a high roll foam surround which allows the woofer to produce riveting low end bass response. The SDR series has a max power rating of 1, 200 watts and a RMS power rating of 600 watts. Sensitivity (SPL): 84.7 dB, mix: 13.5mm one-way, Fs: 32 Hz, frequency response: 22 Hz- 300 Hz, mounting depth: 7.62".