Daakro ZK-TB21 Bluetooth Amplifier Board 2.1 Channel 50W+50W+100W, 12-24V, Bluetooth 5.0 & AUX, DIY Amp Board

Overview

Daakro ZK-TB21 is a compact 2.1-channel amplifier board designed for DIY wireless speakers and versatile home audio. Built around dual TPA3116D2 chips with PurePath technology, it aims for high fidelity with low distortion, helping music details feel more present and lively.

In a 2.1-channel configuration, the left and right channels each provide up to 50 W, while the subwoofer output can reach 100 W. This balance supports a flexible setup—from compact bookshelf systems to small sub-enabled delights—without taking up too much space.

Flexible inputs for modern and traditional sources

The board offers two input modes: Bluetooth 5.0 for wireless streaming and an AUX input for wired connections to phones, TVs, laptops, and more. This dual option makes it straightforward to switch between devices and enjoy music, movies, and games with ease.

• Bluetooth 5.0 enables stable wireless streaming and quick pairing
• AUX input ensures compatibility with legacy gear and non Bluetooth sources

Power, compatibility, and practical coverage

The ZK-TB21 operates from a wide DC range of 12 to 24 V, allowing you to choose an appropriate power source. It suits speakers in the 30-200 W range with 4-8 ohm impedance, making it compatible with a broad spectrum of DIY builds.

• Supports common 4-8 ohm speakers for flexible matching
• Wide voltage tolerance eases sourcing adapters or batteries for various setups

Safety and performance

Built-in protections guard against over-voltage, under-voltage, overheating, short circuits, and reverse polarity, helping you test layouts with greater confidence and peace of mind.

Tips for best results

For optimal performance, balance input levels with your power supply and speaker impedance. Higher impedance or improper voltage can affect perceived loudness, so a balanced setup tends to feel cleaner with clearer highs and tighter bass.