Mono Bluetooth Amplifier Board 30W - Compact DIY Stereo Option

Our review of the Mono Bluetooth Amplifier Board finds it best suited to DIYers and hobbyists who need a compact, flexible power module for single-driver speakers. The biggest reason to buy is its combination of Bluetooth 5.1 wireless connectivity and three input methods (Bluetooth, AUX, USB) packed into a small 30W mono amp that runs from DC 9-24V, making it easy to fit into custom enclosures or retrofit projects.

Key Features

• 30W output: Provides a usable 30W mono output that is appropriate for small bookshelf or portable speaker builds and everyday listening.
• Bluetooth 5.1: Offers stable wireless connections up to about 32.8ft without obstruction and allows renaming the module for easier pairing.
• Three input methods: Bluetooth, AUX and USB inputs let users switch between wireless streaming and local playback from a USB drive or wired source.
• True stereo pairing: Two identical modules can be paired to create left and right channels for a genuine stereo setup when stereo imaging is required.
• Wide file compatibility: Native support for MP3, WMA, WAV, FLAC and APE lossless formats makes USB playback versatile for different media libraries.
• Wide voltage range: Runs from DC 9-24V so it can be powered by common DC adapters or battery packs for portable applications.

Who It's For

This module is aimed at DIY audio enthusiasts building simple mono Bluetooth speakers, small desktop systems, or portable audio projects where a compact amp board and flexible inputs are important. It is also useful for those who want to retrofit older speaker enclosures with modern wireless capability without redesigning power rails.

It is less suitable for audiophiles seeking high-end fidelity or installers needing multi-channel AV amplification; the board is a single-channel 30W solution intended for small 4-8 ohm, 5-30W speakers rather than large passive arrays or home theater systems.

Pros & Cons

Pros

• Compact 30W module that fits easily into DIY enclosures and portable builds.
• Bluetooth 5.1 with up to ~32.8ft range provides convenient wireless streaming.
• Multiple inputs (Bluetooth, AUX, USB) plus broad audio format support for flexible playback options.
• Ability to pair two modules for true left/right stereo when own stereo setup is desired.

Cons

• Mono output means a single board cannot provide stereo without buying a second unit for left/right channels.
• Requires DC 9-24V power only, so it is not compatible with AC mains without a separate adapter.

Specifications

Output Power	30W (mono)
Power Supply	DC 9-24V, 3A
Bluetooth Version	Bluetooth 5.1 (approx 10m / 32.8ft)
Inputs	Bluetooth, AUX, USB
Supported Formats	MP3, WMA, WAV, FLAC, APE
Compatible Speakers	4-8 ohm, 5-30W

Our Verdict

The Mono Bluetooth Amplifier Board is a practical, low-cost module for DIY speaker projects, offering useful wireless features and multiple inputs in a small package. Hobbyists who need a single-channel 30W solution and the flexibility to play local files or stream via Bluetooth will find it good value; those who need native stereo or larger power should plan to buy two boards or choose a different amp.

Frequently Asked Questions

Can this board be used in a stereo setup?
Yes; pairing two identical boards allows true left and right stereo channels, but each channel requires its own board and power supply.

What power supply does it need?
The board requires a DC 9-24V supply capable of around 3A and is not compatible with AC mains without an appropriate DC adapter.

Does USB play lossless files?
Yes; the board supports WAV, FLAC and APE lossless formats for USB playback.