TPA3118 30W+30W Bluetooth Audio Amplifier Board - Compact Power

In this review the TPA3118 8V~26V DC Audio Amplifier Board is evaluated as a compact, budget-friendly way to add Bluetooth and auxiliary input to passive speakers. The board is aimed at hobbyists and DIY speaker builders who need a reliable Bluetooth audio amplifier that delivers noticeable output without complex wiring. The single biggest reason to buy is the combination of class-D digital amplification and auto Bluetooth pairing on power up, which together make it easy to convert ordinary speakers into a Bluetooth-enabled system.

Key Features

• Automatic Bluetooth pairing: The board enters pairing mode on power up with the device name Xpecial Audio, making initial setup quick for DIY installs.
• Flexible audio inputs: Supports Bluetooth streaming and a 3.5mm auxiliary jack so it works with phones, players, and older audio sources.
• Class-D digital amplification: Provides higher overload capacity than analog amps and reduces crossover and transient intermodulation distortion.
• Wide voltage range: Operates from 8V to 26V DC, which lets builders power it from a variety of battery packs or bench supplies.
• Speaker compatibility: Works with 4, 6 and 8 ohm speakers so typical bookshelf or custom drivers can be used without worry.
• Compact footprint: The 71mm x 52mm size fits neatly inside many small enclosures for portable or compact speaker projects.

Who It's For

The board is well suited to DIY audio enthusiasts and makers who want to repurpose passive speakers into a Bluetooth system or add a powered stage to a small enclosure. Its auto pairing and 3.5mm input simplify integration into projects where easy wireless playback is required.

It is less appropriate for audiophiles seeking high-end fidelity or systems that require advanced tone controls and protection features; this is a straightforward power amplifier board rather than a full-featured receiver.

Pros & Cons

Pros

• Delivers strong output for small to medium speakers with a combined 30W+30W channel capability.
• Bluetooth auto pairing and auxiliary input give flexible connectivity for modern and legacy sources.
• Class-D design reduces distortion issues common to analog designs and handles speaker load variation well.

Cons

• Sound quality reports are mixed among users, so expectations should be realistic for a compact, budget board.

Specifications

Model	TPA3118 audio amplifier board
Output Power	30W + 30W (stated)
Input Voltage	8V~26V DC
Audio Inputs	Bluetooth and 3.5mm auxiliary jack
Speaker Impedance	4 ohm, 6 ohm, 8 ohm
Board Size	71mm x 52mm (2.79 in x 2.04 in)

Our Verdict

The TPA3118 board is a practical value choice for builders who need a compact Bluetooth amplifier with decent power and simple setup. It is especially good for DIY Bluetooth speaker projects where ease of installation and flexible power options matter more than premium audio refinement.

Frequently Asked Questions

Does this board support Bluetooth pairing automatically?
Yes. It automatically enters Bluetooth pairing mode at power on and appears as Xpecial Audio.

What speaker impedances are supported?
The amplifier is compatible with 4 ohm, 6 ohm, and 8 ohm speakers.

What power supply does it need?
It requires a DC supply between 8V and 26V, allowing use with various battery packs or bench supplies.