Digital 2.1 Channel Subwoofer Amplifier Board 6W+6W+25W - Compact HiFi

In this review of the Digital 2.1 Channel Subwoofer Amplifier Board the bottom line is simple: this compact board is for hobbyists and DIY audio builders who want a small, flexible amplifier that delivers clear stereo and a usable subwoofer channel without a large chassis. The reviewer found it earns praise for its low-volume footprint and practical power range, and recommends it when space and versatility matter. The board is best used with a 13.5V or higher supply to reach the stated output, and it stands out for using the TDA1517P in the left and right outputs for reliable hi-fi performance.

Key Features

• 2.1 Channel Design: Provides stereo left-right channels plus a dedicated bass output so a compact system can reproduce full-range sound with enhanced low end.
• TDA1517P Output Stage: The left and right channels employ the TDA1517P enthusiast audio chip, which yields clean, low-distortion mid and high frequencies for small speakers.
• Wide Input Voltage: Accepts DC 6.5-15V so it can be powered from adapters, switching supplies or batteries, giving installation flexibility for car, desktop, or TV use.
• Realistic Power Levels: Delivers about 6W+6W stereo and up to 25W to the subwoofer when fed with the recommended ~13.5V rail, making it suitable for 2-8W full-range and 20-50W subwoofers.
• Compact PCB: Built on 1.6mm FR-4 fiberglass and measuring roughly 2.48x1.77x0.78 in, the board fits tight enclosures and custom projects while providing M3 mounting holes for secure installation.
• Practical I/O: Standard 5.5x2.1mm DC power jack or solder pads and a 3.5mm audio input or pads simplify connections in both permanent and temporary setups.

Who It's For

This board is aimed at electronics hobbyists, DIY audio tinkerers and small-system integrators building compact home theater satellites, desktop speaker pairs with a powered sub, or car audio test rigs. It suits anyone who needs a simple, board-level amplifier that can be integrated into custom enclosures or breadboarded into prototypes.

Those who should look elsewhere include users seeking very high power for large passive speakers, full-featured receivers with digital inputs, or finished consumer amplifiers with built-in protection and cosmetic enclosures. This board is a component, not a finished consumer product.

Pros & Cons

Pros

• Compact, easy-to-mount PCB that fits small enclosures and DIY racks.
• Dedicated subwoofer channel delivers noticeably more bass than simple stereo boards.
• Wide DC input range allows flexible power sourcing for field or bench use.
• Well-matched output stage using TDA1517P for good stereo fidelity on small speakers.

Cons

• Maximum bass power requires a higher voltage (around 13.5V) and a recommended >3A supply, so users may need to upgrade their PSU to reach peak output.
• As a bare board it lacks enclosure, heatsinking and some protection features expected in finished amplifiers.

Specifications

Power Input	DC 6.5-15V (recommend >13.5V for full power)
Recommended Current	More than 3A
Stereo Output	6W + 6W (left and right)
Bass Output	Up to 25W (subwoofer)
Chipset	TDA1517P for left/right output
PCB Material & Thickness	FR-4 fiberglass, 1.6mm
Board Size	2.48 x 1.77 x 0.78 in (63 x 45 x 20 mm)

Our Verdict

The Digital 2.1 Channel Subwoofer Amplifier Board is a strong value for DIY builders who want a compact, flexible amplifier with a real subwoofer channel and reliable stereo chipsets. It delivers practical power for small speakers and subs when paired with a proper 13.5V+ supply, and its small PCB and standard connectors make integration straightforward for projects where a finished amplifier is not required.

Frequently Asked Questions

What power supply is best?
Use a DC supply of about 13.5V or higher and at least 3A recommended to approach the board's maximum stated outputs.

What speakers should I pair with it?
For the stereo channels use 2-4 in or 4-8 ohm full-range speakers rated ~3-25W; for the bass channel a 4-6 in subwoofer rated ~20-50W is suggested.

How do I mount the board?
The PCB has M3 mounting holes and is made on 1.6mm FR-4; allow for the potentiometer protrusion and wire clearance when designing an enclosure.