About this item Built with durable high-grade 5/8 inch thick MDF that withstands heavier 6×9 speakers with airtight and resonant free construction for accurate music reproduction and sound quality (Atrend Bbox). Includes polyfil damping material to absorb vibrations and produce best possible sound; sealed nickel finish metal speaker terminals ensure no air leaks (Atrend Bbox). Compatible with CERWIN Vega XED693 6″ x 9″ 350W Max coaxial speakers featuring curvilinear polypropylene cones, butyl rubber surrounds and 0.75” balanced metal dome tweeters. Dimensions – 13.5″ x 7″ x 6.5″; Weight – 2.858 Kilograms per speaker box (Atrend Bbox).