RI Audio Quad 6" X 9" Speaker Wedge Subwoofer Box With 3/4" MDF Construction Brand new sealed 6" x 9" carpeted Wedge subwoofer truck box with 4 holes from RI Audio. With this boxs 6" X 9" subwoofer mounting holes, this wedge sub-box will help your system deliver deep bass while keeping a clean and sleek look inside your vehicle. This box is constructed out of a sturdy 3/4" High-Grade MDF baffle, wrapped in a durable charcoal carpet, and features pre-installed terminals to make installation as easy as possible. Please see below for more features and specifications. Features And Specifications Outside Height: Front- 7-7/8" Back- 5" Outside Length: 43" Outside Depth: 6-7/8" Volume Per Speaker Chamber: 0.144 Cubic Feet Total Volume: 0.576 Cubic Feet Mounting Depth: 6-1/8" Mounting Hole Width: 5-1/8" Mounting Hole Height: 8-3/4" Weight: 13.9 lbs Openings fit 6 x 9 Speakers Constructed from 1/2" MDF (3/4" Baffle) Four Pre-Installed Terminal Cups for Each Speaker Chamber This listing is for a single 4-way 6x9 speaker box