Universal box template

Single 8-inch 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 from 16 mm (5/8 inch) material in a simple rectangle shape, the cabinet measures 544 × 264 × 237 mm (21.37 × 10.4 × 9.36 in). It includes one internal brace to reinforce the panels and reduce vibration, making it suitable for high-output systems. The design utilizes one L-shaped slot port with an area optimized for high-output drivers with increased cone excursion and airflow demand. This versatile box balances bass extension, size, and low distortion, serving as a general-purpose home subwoofer for music or a space-efficient solution for everyday car-audio use.

Volume & tuning

20 l
Internal volume
38 Hz
Tuning frequency

Box properties

Shape
Simple Rectangle
Material thickness (mm)
16
Material thickness (inch)
5/8
Box dimensions (mm)
544 × 264 × 238
Box dimensions (inch)
21.37 × 10.4 × 9.36
Max RMS speaker power up to
4700 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)
5189
Appearances
View all
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