Single 12-inch Rectangular Bass-Reflex In-Vehicle Subwoofer Box - 40 L / 35 Hz - 578 × 355 × 319 mm

This Vented / Bass-Reflex enclosure is designed for a single 12-inch rectangular subwoofer, featuring a 40 L chamber professionally tuned to 35 Hz. Built with 16 mm (5/8 inch) material in a simple rectangle shape, the external dimensions are 578 × 355 × 319 mm (22.75 × 13.99 × 12.59 in). One internal brace reinforces the cabinet and reduces panel vibration, making it suitable for high-output systems. The design uses one L-shaped slot port with an area optimized for high-output drivers with increased cone excursion and airflow demand. This general-purpose box balances bass extension, size, and low distortion for home stereo systems while remaining compact enough for everyday car-audio use where trunk space and installation constraints are key.