Universal box template
Single 12-inch Rectangular Bass-Reflex Automotive Subwoofer Box - 40 L / 35 Hz - 643 × 410 × 305 mm
18
Car sub
Right-side port
Description
This Vented / Bass-Reflex enclosure is designed for a single 12-inch rectangular subwoofer, featuring a 40 L chamber tuned to 35 Hz. Built from 18 mm (3/4 inch) material in a simple rectangle shape, the cabinet measures 643 × 410 × 305 mm (25.75 × 16.21 × 12.06 in) (width × height × depth). It uses one L-shaped slot port positioned on the right side for consistent installation and visual alignment. The design is optimized for everyday car-audio use, balancing sound quality with limited trunk space and installation constraints. The port area is specifically suited for high-output, large-excursion drivers and SPL-oriented applications with high airflow demand.
Volume & tuning
40 l
Internal volume
35 Hz
Tuning frequency
Box properties
Shape
Simple Rectangle
Material thickness (mm)
18
Material thickness (inch)
3/4
Box dimensions (mm)
643 × 411 × 306
Box dimensions (inch)
25.75 × 16.21 × 12.06
Max RMS speaker power up to
250 W
Speaker mounting panel layers
Single
Number of bands
1
Enclosure & speaker
Enclosure
Vented
Speaker configuration
Single
Number of speakers
1
Speaker size
12" Rectangle
Port
Port type
Rectangular
Port count
1
Port area (sq.mm)
17000
