This document outlines the features and functionality of the ZK-TB21 2.1-channel TPA3116D2 Bluetooth Power Amplifier Module, designed to enhance audio systems with its versatile amplification capabilities. The module integrates a power amplifier with treble and bass control, specifically tailored for subwoofer and stereo channel output. It supports both AUX and Bluetooth audio input, offering flexibility in connecting various audio sources. The design emphasizes ease of use and robust performance, making it suitable for a range of audio applications.

The ZK-TB21 module serves as a central component for building or upgrading a 2.1-channel audio system. Its primary function is to amplify audio signals for two main stereo channels (left and right) and a dedicated subwoofer channel. This configuration allows for a rich and immersive audio experience, separating low-frequency sounds for the subwoofer and mid-to-high frequencies for the stereo speakers. The inclusion of treble and bass regulation provides users with precise control over the sound profile, enabling them to tailor the audio output to their preferences or the acoustic characteristics of their listening environment.

One of the key usage features of this amplifier module is its dual audio input capability. Users can connect audio sources via a traditional AUX input, which is ideal for wired connections from devices like CD players, turntables, or older media players. Alternatively, the integrated Bluetooth 5.0 module offers wireless connectivity, allowing for seamless streaming from smartphones, tablets, or other Bluetooth-enabled devices. This wireless option provides convenience and reduces cable clutter, enhancing the overall user experience. The Bluetooth connection is designed for a range of up to 10 meters in an open environment, ensuring stable audio transmission without significant interference.

The module incorporates a TPA3116D2 chip solution, which is known for its efficiency and ability to suppress AM interference. This feature is crucial for maintaining clear audio quality, especially in environments where electromagnetic interference might be present. The power input range of DC12~24V, with a recommendation for 5A or above for high-power applications, ensures compatibility with various power supplies. This flexibility allows users to select a power source that best suits their specific setup and desired output levels.

Control over the audio output is intuitive and comprehensive. The module features multiple knobs for adjusting different aspects of the sound. A dedicated subwoofer frequency knob allows users to set the crossover point for the subwoofer, determining which frequencies are directed to it. This is essential for blending the subwoofer's output seamlessly with the main speakers. A separate subwoofer volume knob provides control over the intensity of the bass. For the main left and right channels, there are distinct knobs for treble and bass adjustment, enabling fine-tuning of the stereo sound. Finally, a main volume knob controls the overall output level of the entire system, ensuring convenient adjustment of the listening experience.

The physical layout of the module is designed for straightforward integration. It includes clearly labeled terminals for power input, speaker output (left, right, and subwoofer), and audio input. The power input supports both a 5.5x2.1DC head and 2P terminals, offering versatility in power connection methods. The speaker terminals are designed for easy connection of passive speakers, accommodating a wide range of speaker impedances and power ratings.

Maintenance features are primarily focused on ensuring the longevity and reliability of the device. The module is equipped with a comprehensive set of protection mechanisms. These include overvoltage protection, which safeguards the circuit from excessive input voltage; undervoltage protection, preventing damage from insufficient power supply; overheating protection, which activates if the module's temperature exceeds safe limits; DC detection, to prevent DC voltage from reaching the speakers; and short circuit protection, which automatically shuts down the output in case of a short circuit in the speaker wiring. These built-in safeguards are critical for protecting both the amplifier module and the connected speakers from potential damage, thereby extending the lifespan of the entire audio system.

The construction of the module also contributes to its durability and performance. It features a low-noise front-stage operational amplifier, which helps in preserving the fidelity of the audio signal before amplification. Shielded power inductances are used to minimize electromagnetic interference and ensure stable power delivery to the amplifier circuits. Large-capacity energy storage capacitors are integrated into the design to provide stable power reserves, which are essential for handling dynamic audio passages and delivering powerful bass without distortion. The use of an original imported 3116 amplifier chip further underscores the commitment to quality and performance. Additionally, a 50MM25MM10MM heat sink is included to efficiently dissipate heat generated during operation, ensuring stable performance even under demanding conditions.

The installation process is designed to be user-friendly, with an installation diagram and a list of components provided in the manual. The module comes with necessary hardware such as knobs, copper pillars, screws, a free screwdriver, and 2P terminals, facilitating assembly and integration into a custom enclosure or existing audio setup. This attention to detail in providing all necessary components simplifies the user's task of setting up the amplifier.

In summary, the ZK-TB21 2.1-channel TPA3116D2 Bluetooth Power Amplifier Module is a well-rounded audio amplification solution. It offers robust functionality with its 2.1-channel output, flexible audio input options (AUX and Bluetooth), and precise sound control through treble, bass, subwoofer frequency, and volume adjustments. Its comprehensive protection mechanisms and quality component selection ensure reliability and longevity, while the user-friendly design and included installation accessories make it accessible for a wide range of audio enthusiasts and DIY builders. The module's ability to deliver powerful and clear audio, coupled with its protective features, makes it a valuable addition to any personal audio project or home entertainment system.

Walfront ZK-TB21 - Installation Guide and Components; Assembly Components; Included Accessories