50W2+100W Bluetooth Amplifier Board with Treble and Bass Control - 2.1

Our review of this 2.1 channel Bluetooth amplifier board finds it best suited for DIY home theater and speaker projects where flexible tone shaping and reliable power are priorities. The module delivers a straightforward way to add wireless input and a dedicated subwoofer channel to bookshelf or custom enclosures, and the standout reason to buy is the physical treble and bass control knobs that let users tune sound without software. It is a practical option for hobbyists who want clean, high-fidelity amplification from a compact board and are comfortable wiring a small module into a home setup.

Key Features

• 2.1 Channel Output: Provides two 50W stereo channels plus a 100W subwoofer channel to add real low-end weight to music and movies.
• TPA3116D2 Chips: Dual TPA3116D2 amplifiers deliver low distortion and high resolution for clearer midrange and tighter bass.
• Treble and Bass Control: Five independent knobs let you tailor high, low, and overall volume for room and speaker matching without an app.
• Bluetooth 5.0 and AUX Inputs: Password-free BT pairing with up to about 49 ft unobstructed range and a 3.5mm jack for wired sources when needed.
• Wide Voltage Range: Runs from DC 12-24V so output can be increased with higher supply voltage, making it compatible with many desktop and bench power supplies.
• Protection Features: Built-in safeguards including over temperature, short circuit, reverse connection and clipping protection help protect speakers and the module.

Who It's For

This board is ideal for DIYers building a compact home theater amp, hobbyists upgrading older computer speakers with a dedicated subwoofer, or anyone who wants physical tone controls and wireless input without complex setup. It fits well in small enclosures or as a bench amplifier for testing drivers because of its modest footprint and DC 12-24V range.

It is less suitable for users who need a finished consumer product with enclosure, remote control, or streaming services built in. If you need plug-and-play furniture-ready gear with cosmetic finishes, a preassembled receiver or powered speaker system would be a better choice.

Pros & Cons

Pros

• Robust power: 50W+50W+100W delivers substantial output for medium-sized rooms when paired with appropriate speakers.
• Custom tone shaping via physical treble and bass knobs makes quick sound adjustments simple.
• Bluetooth 5.0 offers reliable wireless connections and AUX provides a fallback for devices without BT.
• Comprehensive protection features reduce the risk of damage during use.

Cons

• Module-only format requires user-built enclosure and wiring; not a finished consumer product.
• Performance depends on using a sufficiently rated DC power supply and suitable speakers to reach rated output.

Specifications

Model	ZK-TB21
Channels	2.1 channel (left, right, subwoofer)
Output Power	50W + 50W + 100W
Amplifier Chip	TPA3116D2 (dual)
Inputs	Bluetooth 5.0 and 3.5mm AUX
Power Supply	DC 12-24V, 5A or above recommended
Protection	Overtemp, short circuit, reverse connection, over/under voltage, clipping

Our Verdict

The EPLZON 50W2+100W board is a strong value for DIYers who want a compact, tunable 2.1 amplifier with wireless input and robust protections. It delivers good fidelity from the TPA3116D2 chips and useful tonal controls, but buyers should budget for a proper power supply and enclosure to get the best results.

Frequently Asked Questions

How far does Bluetooth reach?
The Bluetooth 5.0 module can reach roughly 49 ft in an open environment, though walls and interference will reduce that range.

What power supply do I need?
Use a DC 12-24V supply rated 5A or higher; higher voltage within that range increases available output power if your speakers can handle it.

Can I use AUX and Bluetooth at the same time?
You should disconnect Bluetooth when using AUX to ensure the module accepts the wired input; the board prioritizes one input at a time.