ZKHT21 2.1 Channel Subwoofer Audio Amplifier Board Deliver powerful, quality sound for your home or project setup with the ZKHT21 2.1 channel audio amplifier board. Built for audiophiles and enthusiasts, this compact yet performance unit offers precise control, impressive power, and versatile input options, making it ideal for upgrading your sound system. Key Features and Benefits: True 2.1 Channel Configuration Connect two passive speakers and drive one subwoofer simultaneously. Dedicated treble and bass adjustment knobs allow you to finetune audio balance. Independent subwoofer volume control and 20200Hz frequency adjustment enable precise for richer, more layered sound. Powerful Output Performance Delivers 160W per channel for left and right speakers (48 ohms, 30200W rating) and 220W for the subwoofer (30220W rating). Compatible with DC1536V power supply at 8A or higher. Higher supply voltage and current can increase output power; lower speaker resistance can also boost performance. Fidelity Audio Quality Equipped with two TPA7498E Class D amplifier chips for ultralow distortion across the full audio frequency range, ensuring clear, detailed playback. The board's window tin spraying design enhances output efficiency. Four lownoise 5532 preamp circuits improve gain, sound clarity, and volume. Multiple Input Options for Versatility Supports Bluetooth 5.0 for fast, stable, and lossless wireless audio transmission up to 15 meters (49 feet). Also includes USB flash drive playback, USB sound card input, and 3.5mm AUX input for direct wired connections. When using AUX mode, ensure Bluetooth is disconnected for performance. Practical Audio Control Front panel controls offer intuitive adjustments for treble, bass, subwoofer level, and subwoofer frequency, giving you precise control over your listening experience without complicated menus. Applications: 1. Home Stereo Upgrade Transform an existing passive speaker setup into a powerful 2.1 channel audio system with deep bass and enhanced clarity. 2. DIY Audio Projects Ideal for building custom speaker enclosures, integrating into multimedia systems, or upgrading older equipment to modern performance standards. 3. Desktop or Workshop Audio Pair with a compact speaker array and subwoofer for quality playback in small spaces without sacrificing power or control. Specifications: Model: ZKHT21 Channels: 2.1 (two main channels plus subwoofer) Output Power: 160W x 2 main channels, 220W subwoofer Speaker Compatibility: 48 ohms, 30200W main speakers, 30220W subwoofer Power Supply: DC 1536V, 8A or higher Amplifier Chips: 2 x TPA7498E Class D Preamp Modules: 4 x 5532 lownoise preamplifiers Subwoofer Frequency Adjustment: 20Hz to 200Hz Input Options: Bluetooth 5.0, USB flash drive, USB sound card, 3.5mm AUX Bluetooth Range: Up to 15 meters / 49 feet Recommended Power Supply Capacity: Exceeds the amplifier's actual working power for performance With the ZKHT21 2.1 channel amplifier board, you gain a reliable, power, and adjustable solution that integrates seamlessly into a wide range of audio setups while delivering impressive, clear, and precise sound.