2.1 Channel Power Amplifier Board 20W - Compact Bluetooth 5.0 Module

Our review of the 2.1 Channel Power Amplifier Board finds it best suited to hobbyists and DIY audio builders who need a compact, Bluetooth 5.0 driven amp module for small home theater or active speaker projects. The single biggest reason to buy is the configurable 20W maximum output (Bass 10W + sub-box 10W split as 5W x 2) delivered from a 5V supply, which lets builders add Bluetooth streaming to compact speaker enclosures without a bulky external amplifier. It is straightforward to integrate but demands careful matching of power supply and speaker choices.

Key Features

• Bluetooth 5.0: Reliable wireless input that supports phones, MP3 players, and computers for modern streaming convenience.
• Configurable 20W maximum power: Offers a combined Bass 10W and sub-box 10W output useful for small active speaker setups when paired with suitable drivers.
• Low voltage operation: Runs from a single DC 5V source (4.8-5V) so it can be powered from common USB power supplies or small 5V adapters with sufficient current.
• Compact module: Small, lightweight board that is easy to mount inside hobby enclosures or retrofit into existing speaker boxes.
• Simple wiring: Ships with three connection cables to get audio and power hooked up quickly during prototyping and installation.

Who It's For

This board is well suited for makers building compact active speakers, desktop subwoofer add-ons, or small home theater projects where space is limited and Bluetooth streaming is desirable. Its 5V operation and light weight make it a practical choice for battery-powered or USB-powered experiments when the correct current supply is provided.

It is not ideal for large rooms or high-SPL systems; anyone seeking high-power PA output or heavy low-frequency extension should look for a higher-voltage amplifier and larger woofers. Also, users who cannot meet the recommended 2.5A-3A power input or who expect to drive 6-8W woofers reliably should consider different modules or dedicated amplifiers.

Pros & Cons

Pros

• Compact Bluetooth 5.0 module lets users add wireless playback without complex source gear.
• Configurable 20W peak output provides clear dynamics for small room listening when matched to proper drivers.
• Runs from a single 5V supply, making integration with USB power banks and modern adapters easy if current is sufficient.

Cons

• Strict requirements on power supply and speaker selection mean it can be unforgiving if paired with undersized or mismatched woofers.

Specifications

Bluetooth	5.0
Power supply	DC 5V (4.8-5V), 2.5A-3A recommended
Maximum power	20W (Bass 10W + sub-box 10W / 5W x 2)
Package weight	Approx. 29g
Package contents	1 module, 3 connection cables

Our Verdict

The 2.1 Channel Power Amplifier Board is a compact, cost-effective way to add Bluetooth streaming and modest amplification to small speaker projects, provided you pair it with the correct 4-5W satellite drivers and a reliable 2.5A-3A 5V supply. For DIYers and hobbyists building desktop or small-room systems it offers good value and flexibility; for users needing louder, deep-bass performance, a higher-voltage amplifier and larger woofers are a better choice.

Frequently Asked Questions

Can this board run from a USB power bank?
Yes, it can run from USB power if the bank can supply 2.5A-3A at 5V; lower-current banks may cause reduced output or instability.

What speaker sizes should be used?
Use 4-5W full-range satellites for left and right and a 10W-15W woofer for bass; avoid 6W or 8W woofers as recommended for stable operation.

What audio sources are supported?
The board accepts Bluetooth streaming and wired inputs from MP3 players, phones, computers, and other common devices.