ASC Mazda RX8 Coupe 2003-2012 Dual 12" Subwoofer Custom Fit Trunk Sub Box Speaker Enclosure Dimensions: Width 34-3/4" x Height 13" x Top Depth 12-1/2" x Bottom Depth 8-1/4" Install Location: Behind Rear Seat in Trunk Install Notes: No Modifications Required Mounting Depth: 8-1/2 Inches Air Space: 0.75 Cubic Feet