JBL MTC-300BB12 Best in Class Three Cubic Foot Back Box for Control 300 - 12" ModelsJBL MTC 300BB12 Rectangular, 3 cubic foot backcan for any of the 12 models Features Extra thick 16 gauge metal construction. Lined with 12 mm (1 2 inch) thick MDF to eliminate resonances and to provide extra bass response. Knockouts on top and all four sides. Dual mounting system for baffle.
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JBL MTC-300BB12 Best in Class Three Cubic Foot Back Box for Control 300 - 12" Models