MADE IN THE USA: Proudly manufactured with premium craftsmanship using only the finest quality materials for reliable performance. 3/4" MDF CONSTRUCTION: Built from USA heavy-duty medium-density fiberboard for strength, durability, and reduced vibrations. SEALED CHAMBERS: Each chamber is sealed to deliver tighter bass response and improved sound clarity. SECURE CONNECTIONS: Includes gold spring-loaded terminals and machine precision cut mounting holes for a perfect speaker fit. VERSATILE DESIGN: Double-angle structure fits more vehicles; supports mounting depth up to 7.0". Dimensions: 49" L x 8.5" D x 8" Front H x 5" Back H. The Rockville RS6X9-4 Quad 6x9" Speaker Enclosure Box is designed for car audio enthusiasts who want durability, precision, and powerful sound. Proudly made in the USA, this enclosure is built with 3/4" heavy-duty MDF for maximum strength and minimal resonance. Its double-angle design allows flexible installation across different vehicle types, while sealed chambers deliver tighter bass and cleaner audio performance.Engineered for universal compatibility, the RS6X9-4 features machine precision cut mounting holes and gold spring-loaded terminals for secure connections and easy installation. With support for mounting depths up to 7.0", it fits virtually all 6x9" speakers on the market. Measuring 49" L x 8.5" D x 8" front height x 5" back height, this enclosure combines durability with a professional black carpet finish, making it a reliable choice for enhancing any car audio system.