The ZK-HT21 is a high-power, high-fidelity 2.1 channel amplifier board that utilizes the TDA7498E chip to deliver an impressive 440W total output. It features integrated Bluetooth 5.0 and a dedicated subwoofer channel, making it one of the most powerful "all-in-one" modules for custom home audio and high-performance DIY sound systems.

Specifications

• Amplifier Chip: TDA7498E
• Bluetooth Version: 5.0
• Operating Voltage: DC 15V to 36V (36V recommended for max power)
• Output Power: 160W x 2 (Stereo) + 220W (Subwoofer)
• Input Methods: Bluetooth + AUX + USB (USB Flash Drive / USB Sound Card)
• Channel Count: 2.1 Channel
• Compatible Speaker Impedance: 4 ohm to 8 ohm

Features

• Five-Knob Audio Control: Features dedicated potentiometers for Master Volume, Stereo Treble, Stereo Bass, Subwoofer Frequency (Crossover), and Subwoofer Volume.
• TDA7498E Dual-Chip Power: Utilizes the high-voltage TDA7498E architecture to provide significantly more "headroom" and raw power compared to TPA3116-based boards.
• Ultra-Quiet Active Cooling: Equipped with a large aluminium heatsink and a low-noise cooling fan that automatically activates to maintain optimal performance during high-load operation.
• Wuzhi Audio App Support: Compatible with the Wuzhi Audio app for customizing Bluetooth names, passwords, EQ settings, and firmware updates.
• High-Quality Audio Path: Uses professional-grade inductors and filtering capacitors to ensure a clean, stable signal with minimal harmonic distortion.
• Multiple Safety Protections: Built-in mechanisms for overvoltage, undervoltage, clipping, overheating, and short-circuit protection.

Power Supply Recommendation

Due to its high power rating, the ZK-HT21 requires a substantial power source:

• Minimum Voltage: 15V (will result in significantly lower output power).
• Maximum Voltage: 36V (required to reach the 160W+160W+220W rating).
• Current: Use a power supply with at least 10A to 20A (36V 10A is a common choice for high-performance builds).

Common Applications

• Powering high-output 2.1 home theater systems and large floor-standing speakers.
• Building professional-grade outdoor party speakers and mobile DJ units.
• Dedicated amplification for high-excursion passive subwoofers.
• High-power desktop audio workstations for audiophiles.