Arc Audio X2 10D4 10” 4 Ohm Subwoofer Designed And Engineered In The USA High-Temperature Black Anodized Copper Coated Aluminum Voice Coil Linear Design For Improved Dynamics And SPL At Low And High Volumes Cellulose Fiber Composite Cone Stamp Steel Basket Flat Profile, Linear High-Roll Conex Spider With Post-Process Woven Integrated Tinsel Leads Designed For Small To Moderate Sized Sealed And Ported Enclosures Mounting Depth 5-7/8" Cutout Diameter 9-1/8" Minimum Sealed Enclosure - 0.8 cu ft Optimum Sealed Enclosure - 1.0 cu ft Maximum Sealed Enclosure - 1.2 cu ft Specifications - Power Handing (Peak) - 400 Watts Power Handling (RMS) - 200 Watts Impedance - Dual 4 Ohm Minimum Sealed Enclosure - 0.65 cu ft Optimum Sealed Enclosure - 1.0 cu ft Maximum Sealed Enclosure - 1.2 cu ft Cutout Diameter - 9-1/8" Mounting Depth - 5-7/8"