Flatlyne-12 D4 Incriminator Audio 12" 750W Dual 4-Ohm Flatlyne Series FL12D4 - Incriminator Audio 12" Dual 4-Ohm 750W RMS Flatlyne Series Subwoofer Outer Diameter: 12 3/8" Mounting Diameter: 11 1/8" Mounting Depth: 6 3/4" Displacement: .13 cu. ft.