Arc Audio ARC-12D4 12” 4 Ohm Subwoofer Designed And Engineered In The USA High-Temperature Black Anodized Voice Coil Linear Design For Improved Dynamics And SPL At Low And High Volumes One Piece Molded Rubber Surround Stamped Steep Basket Progressive Flat Layered Spider With Integrated Tinsel Leads Designed For Small To Moderate Sized Sealed And Ported Enclosures Mounting Depth 5-3/4" Cutout Diameter 11-1/8" Minimum Sealed Enclosure - 0.9 cu ft Optimum Sealed Enclosure - 1.1 cu ft Maximum Sealed Enclosure - 1.125 cu ft Specifications - Power Handing (Peak) - 700 Watts Power Handling (RMS) - 350 Watts Impedance - Dual 4 Ohm Minimum Sealed Enclosure - 0.9 cu ft Optimum Sealed Enclosure - 1.1 cu ft Maximum Sealed Enclosure - 1.25 cu ft Cutout Diameter - 11-1/8" Mounting Depth - 5-3/4"