Q Power TUNDRA12 4DOOR Dual 12-Inch Unloaded Subwoofer Enclosure for Toyota Tundra 2007-2016 Dual 12" Custom Fit Subwoofer Enclosure for 2007-2016 Toyota Tundra Crew Cab Trucks Under Seat Down Firing Subwoofer Design - Constructed out of 5/8" MDF Independent Subwoofer Chambers with Separate Terminal Cups Finished in a High Quality Charcoal Carpet for an Attractive Appearance Air Space: 0.63 Cubic Ft Per Sub Chamber