Qpower Dual 12" Vented Extra Large SPL w/ Square Holes "Q Bomb" Rockville RQ12VL SQ Dual 12" Vented Solo Baric L7S/L7R S12L7 Sub Enclosure Box. Finished with Durable Bed Liner. 3/4" MDF. High Quality Spring Loaded Terminals. Air Space: 2.25 Cubic Feet (per sub). Tuning Frequency: 42 HZ. Product Dimensions (H x W x D): 14.5" x 36" x 22" inches.