MDF construction Fits behind the rear seat Back Wall liner needs to be trimmed or removed DOES NOT fit with the Sony sub system.  It must be removed. Air Space = .65 cubic foot Amp rack is 14" x 14" Mounting Depth = 5.25" Mounting Depth 12" sub  = 5"  Mounting Depth based on 6" diameter magnet Speaker terminals included Hole cutout for 8" Sub = 7" Hole cutout for 10" Sub = 9 1/8" Hole Cutout for 12" Sub = 11" Subwoofers and/or amplifiers not included Hole Cutouts adjustable per request Subwoofer Mounting depth based on the most common size subwoofers. Some Subwoofers with oversized framing/magnets may not fit without modification. If you're using a subwoofer that is close to the max specs please contact us for fitment confirmation.