50W+50W Bluetooth Amplifier Board with Treble and Bass Control - DIY

In this review of the EPLZON 50W+50W Bluetooth Amplifier Board (model ZK-502T), the bottom line is clear: this module is aimed at DIY builders and hobbyists who want flexible tone control and reliable Bluetooth input without fuss. The biggest reason to buy is the combination of dual TPA3116D2 chips for clean, low-distortion output plus independent treble, bass and volume knobs that make quick tonal shaping easy during setup or live use. The review covers everyday listening, simple installs, and what to expect from the wireless and AUX options.

Key Features

• Dual TPA3116D2 chips: Delivers high-fidelity sound with ultra-low distortion and AM interference suppression for clearer playback at higher volumes.
• Treble and bass control: Independent high and low knobs let users tailor tone on the fly to match speakers and room acoustics without extra equalizers.
• Bluetooth 5.0 and AUX inputs: Provides password-free wireless pairing with up to about 49 ft unobstructed range and a 3.5mm jack for devices without Bluetooth.
• Wide voltage range: Works from DC 9-24V and supports 12-24V/5A or above so builders can choose power supplies to increase output headroom.
• Comprehensive protection: Built-in over temperature, short circuit, reverse connection, clipping and voltage protections protect the amplifier and connected speakers.
• Compact DIY form factor: A 110 x 70 x 21mm board size and included manual make it practical for home, party, or portable speaker projects.

Who It's For

This amplifier board is best for hobbyists, tinkerers and small-scale DIY speaker builders who want a compact, affordable stereo amp with adjustable treble and bass and modern Bluetooth connectivity. It suits home audio upgrades, small party speakers, and anyone building an active bookshelf or portable enclosure.

It is less suitable for users who need a finished consumer product with enclosure, remote control, or multichannel home theater processing. Buyers expecting wall-plate ease-of-use or plug-and-play consumer gear should look for a completed amplifier instead of a bare module.

Pros & Cons

Pros

• Clear, high-fidelity output thanks to dual TPA3116D2 amps and low-noise preamplifier design.
• Practical tone shaping with separate treble and bass knobs plus volume for quick adjustments.
• Flexible inputs with Bluetooth 5.0 and a 3.5mm AUX jack for wired sources.
• Robust protection features that reduce risk during DIY installations.

Cons

• Shipping as a bare board requires enclosure, wiring and appropriate power supply which adds cost and effort.
• Stated output power wording is inconsistent in the listing, so builders should confirm supply voltage and speaker match for intended power levels.

Specifications

Product model	ZK-502T
Power amplifier chip	Dual TPA3116D2
Output power	50W + 50W (stereo)
Voltage input	DC 9-24V (recommended 12-24V/5A+)
Bluetooth version	5.0 (unobstructed ~10 m / ~49 ft)
Input methods	Bluetooth and 3.5mm AUX
Size	110 x 70 x 21 mm

Our Verdict

The EPLZON ZK-502T amplifier board is a smart buy for DIYers seeking a compact, tonal-flexible stereo amp with modern Bluetooth and solid protection features. It delivers clean sound from the dual TPA3116D2 chips and the onboard treble and bass controls speed tuning for different rooms and speakers, making it good value when paired with a proper enclosure and power supply.

Frequently Asked Questions

Does this board support wired AUX input?
Yes, it has a 3.5mm AUX jack; when using AUX be sure Bluetooth on the module is disconnected to avoid input conflict.

What supply voltage is best?
It runs on DC 9-24V, and using 12-24V with a 5A or higher supply yields more output headroom for higher power to the speakers.

Are protections included?
Yes, the board includes over temperature, short circuit, reverse polarity, clipping, overvoltage and undervoltage protections for safer operation.