ZK-TB21 Stereo Amplifier with Bluetooth

The ZK-TB21 Hi-Fi Stereo Amplifier is a compact yet powerful 2.1 channel audio amplifier board designed for premium sound performance. Built around the reliable TPA3116D2 amplifier chip, it delivers 50W per channel for left and right speakers and up to 100W for a dedicated subwoofer, making it ideal for home audio systems, DIY speaker builds, and multimedia setups. With built-in Bluetooth 5.0, the amplifier provides stable, high-quality wireless audio streaming from smartphones, laptops, tablets, and other Bluetooth-enabled devices. It also supports AUX input, giving you flexible connectivity options. Independent controls for volume, bass, and treble allow precise sound tuning to match your listening preferences.

This package includes a screwdriver, making installation and wiring more convenient especially for DIY projects and quick setups. Its compact design, high efficiency, and low heat output ensure reliable long-term operation. Whether upgrading an existing system or building a custom amplifier, the ZK-TB21 offers excellent value and performance.

Specification :

• Amplifier Type : 2.1 Channel Hi-Fi Audio Amplifier
• Amplifier Chip : TPA3116D2
• Output Power : 50W × 2 + 100W
• Bluetooth Version : 5.0
• Input Modes : Bluetooth, AUX
• Operating Voltage : DC 12V – 24V
• Speaker Impedance : 4Ω – 8Ω
• Efficiency : Up to 90%
• Included Accessory : Screwdriver