Universal box template

Single 8-inch Rectangular Vented / Bass-Reflex Subwoofer Box - 20 L / 38 Hz

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Description

This vented (bass-reflex) enclosure is designed for a single 8-inch rectangular subwoofer, featuring a 20 L chamber tuned to 38 Hz. Built with a simple rectangle shape from 18 mm (3/4 inch) material, the cabinet measures 570 × 286 × 258 mm (22.89 × 11.32 × 10.19 in). The design incorporates one L-shaped slot port with a port area suitable for high-output, large-excursion drivers and SPL-oriented use with high airflow demand. One internal brace reinforces the cabinet and reduces panel vibration, making it ideal for high-output systems. Whether used as a general-purpose home subwoofer for music and stereo systems or in everyday car-audio applications, it balances bass extension, cabinet size, output, and low distortion while respecting limited trunk space and installation constraints.

Volume & tuning

20 l
Internal volume
38 Hz
Tuning frequency

Box properties

Shape
Simple Rectangle
Material thickness (mm)
18
Material thickness (inch)
3/4
Box dimensions (mm)
570 × 287 × 258
Box dimensions (inch)
22.89 × 11.32 × 10.19
Max RMS speaker power up to
5300 W
Speaker mounting panel layers
Single
Number of bands
1

Enclosure & speaker

Enclosure
Vented
Speaker configuration
Single
Number of speakers
1
Speaker size
8" Rectangle

Port

Port type
Rectangular
Port count
1
Port area (sq.mm)
8107
Appearances
View all
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