Magna Box SPB-212SPL Dual 12" Subwoofer Universal Fit Vented Ported Subwoofer Enclosure, Competition Grade Build Quality and Design, 11" Subwoofer Hole Cut Out, 10.25" Subwoofer Mounting Depth Dual Chamber Design For Most Accurate Bass Response Each Subwoofer has it's own chamber, terminal cup, and port High Quality 3/4" MDF Construction Premium Grade Charcoal Carpet Finish High Quality Ring Terminal Cups (1 Per Chamber) with Gold Plated Screw Terminals