ASC Chevy Avalanche or Cadillac Escalade EXT 2002-2013 Dual 12" Subwoofer Custom Fit Behind Seat Sub Box Speaker Enclosure Dimensions: Width 50-1/2" x Height 20-1/2" x Top Depth 1" x Bottom Depth 6-1/2" Install Location: Behind Rear Seat Install Notes: Installs in front of the midgate Mounting Depth: 4 Inches Air Space: 0.70 Cubic Feet