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NEW TB 4-Pack Quad 3" 3D-Printed 25 Watt Powered DIY Subwoofer Kit

Parts ExpressPart # 300-7368
The TB 4-Pack 3D-Printed Powered Subwoofer Kit delivers genuine low-frequency performance from a footprint small enough to disappear under a desk or beside a media console. By combining four high-excursion 3" drivers, a 6-1/2" passive radiator, and a dedicated 25 watt subwoofer amplifier, this DIY design produces deep, satisfying bass from an enclosure that fits where traditional subwoofers simply cannot. Reaching down to 40 Hz with impressive output for its size, this kit is ideal for compact home audio systems that still deserve deep bass extension. It is also a perfect project for hobbyists, makers, and 3D printing enthusiasts who want to build a micro sized powered subwoofer.

Key Features

  • Quad 3" high-excursion Tang Band RBM subwoofer drivers
  • 6-1/2" passive radiator for deep extension in a tiny enclosure
  • 3D printable enclosure with one-piece and three-piece options – free file download
  • 25 watt Dayton Audio plate amplifier with adjustable crossover and gain
  • Designed for nearfield systems, small rooms, and space-limited setups
  • Response reaching down to 40 Hz with impressive output for its size
NEW $149.98
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MSRP: $385.98
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Overview

TB 4-Pack Quad 3" 3D-Printed 25 Watt Powered DIY Subwoofer Kit

TB 4-Pack 3D-Printed 25 Watt Powered Subwoofer Kit

The TB 4-Pack quad 3" 3D printed powered subwoofer kit is designed for listeners who want real subwoofer impact without giving up valuable space, and for makers who love bringing their own gear to life. It is a perfect fit for desktop systems, bedroom, office setups, sim racing rigs, and apartments where a full-size sub just isn't practical. Even with its ultra-compact footprint, this design moves an impressive amount of air, adding weight, depth, and authority to music, movies, and games. A key part of the experience is printing and assembling your own enclosure, making this an especially rewarding project for 3D printing enthusiasts and DIY audio builders alike. The result is surprisingly big bass from a custom-built subwoofer that fits almost anywhere.

Quad High Excursion Micro Subwoofers

At the heart of the system are four Tang Band W3-2052SC 3" RBM subwoofer drivers. These unique drivers use a dual-surround design instead of a traditional spider, allowing for unusually high excursion from a very compact frame. That extra travel translates directly into greater displacement, which is critical in a micro subwoofer like this. Using four drivers spreads the workload while dramatically increasing total air movement compared to a single small woofer. The result is cleaner output, stronger low-frequency authority, and better overall control than you would expect from drivers of this size.

Passive Radiator Keeps Things Compact

Low-frequency performance is supported by the Dayton Audio DS175-PR passive radiator, which allows the compact enclosure to be tuned much lower than a port of similar size could achieve. Instead of producing bass itself, the radiator moves in response to the air pressure generated by the four active drivers, reinforcing their output at the system’s tuning frequency. This approach delivers deeper extension from a very small cabinet while eliminating the air noise and turbulence that can come from small ports. The result is cleaner, more controlled bass that works especially well in nearfield and small-room environments where clarity and balance matter. By enabling low tuning without increasing enclosure size, the passive radiator is a key part of how this system reaches down to 40 Hz with authority.

Small Amplifier, Surprising Output

Powering the system is the Dayton Audio SA25 subwoofer amplifier. This compact class AB plate amp delivers 25 watts RMS into a 4 ohm load, a great match for driving the four Tang Band drivers to strong output while maintaining control. An adjustable low-pass crossover from 60 to 180 Hz makes it easy to blend with a wide range of speakers, from small desktop monitors to bookshelf systems. Line-level and speaker-level inputs provide flexible integration with stereo receivers, amplifiers, and powered speakers. Simple gain adjustment allows you to dial in the right balance for your room and listening habits.

Free 3D Print File and Step-by-Step Instructions

The enclosure was developed to be easily produced on consumer-grade 3D printers, giving this kit impressive flexibility while keeping the overall footprint extremely compact. Two enclosure versions are included: a three-piece design suited for printers with standard build volumes, and a one-piece option for larger machines. The three-piece version assembles with basic screws and a Phillips screwdriver, with no glue or additional finishing work required. Its structure is engineered to properly support the drivers and passive radiator while maintaining minimal size. This approach allows builders to create a high-performance subwoofer using tools and equipment many hobbyists already have at home.

The 3D files are provided in both .STEP and .3MF formats to support a wide range of design and printing workflows. Use the links below to download the files and the assembly manual.

Download the 3D files Now

Download the Assembly Manual

The TB 4-Pack Powered Subwoofer Kit is a perfect blend of compact size, performance, and hands-on experience. It fits where most subwoofers can't, integrates easily into small systems, and rewards builders with both a fun project and serious bass in the end. Everything you need to complete the subwoofer is included in the kit except for the enclosure itself, including the four drivers, passive radiator, amplifier, gasket, and all necessary mounting screws. Whether tucked under a desk, hidden beside a couch, or added to a compact media system, this kit proves that impressive low-frequency impact can come from a very small package built by you.

Includes:

Part #DescriptionQty
299-572Tang Band W3-2052SC 3" Subwoofer
4
300-782Dayton Audio SA25 25W Amplifier
1
295-498Dayton Audio DS175-PR Passive Radiator
1
M5 x 30mm Cap Head Screws Black
20
#6 x 3/4" Pan Head Screws Black
25
Speaker Gasketing Tape 1/8" x 3/8"
5 ft
1/4" x 1" Zinc Fender Washers
5

Requirements:

  • 3D Printer: Minimum build volume of 230mm wide × 230mm deep × 180mm high
  • Phillips screwdriver
  • 4 mm Hex (Allen) bit or driver
  • Wire cutters/ strippers
  • Utility knife/ sharp knife

Product Details

BrandParts Express
Part Number300-7368
UPC848864081939
Unit of MeasureEach
Weight5.73

Product Specifications

Cabinet Dimensions (HxWxD)9.25" x 9" x 7.25"
Cabinet OptionsWithout Cabinet
ConfigurationSubwoofer
Speaker TypeSubwoofer
Woofer Diameter3"

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