Product Information
About
【Revive Your Old Speakers】Bring your unused passive speakers back to life with the ZK-MT21 2.1 Channel Bluetooth Amplifier Board. Upgrade traditional speakers into a wireless audio system with Bluetooth 5.0 connectivity. Perfect for DIY speaker upgrades, home theater setups, desktop multimedia systems, and car audio projects. Designed for budget-conscious audio enthusiasts who want an affordable way to build a high-value 2.1 channel sound system.
【Powerful 2.1 Channel Output & Wide Speaker Compatibility】Enjoy powerful stereo performance with 50W × 2 left/right channel output and up to 100W subwoofer output. Compatible with 20-100W speakers and 4-8Ω impedance, supporting 6.5-inch stereo speakers and 8-inch subwoofers for rich bass, clear vocals, and immersive sound.
【Professional Sound Tuning with Low Distortion & Noise Reduction】With THD ≤0.1%, the ZK-MT21 delivers cleaner and more accurate audio performance. Built-in AM interference suppression technology helps reduce environmental noise and signal interference, providing a smoother listening experience for music, movies, and gaming.
【Bluetooth 5.0 Wireless Connectivity & Flexible Power Options】Supports Bluetooth 5.0 wireless transmission (range up to 15 meters/49 feet with a clear line of sight) and 3.5mm AUX input, offering versatile connection methods. A DC 12–24V power supply (with a current of 5A or higher) is recommended for optimal performance; a 9V/1A power supply may also be used, though output power and sound quality may be reduced. Note: Do not connect to a 24V battery pack.
【Easy DIY Installation with Reliable Heat Dissipation Protection】Designed for DIY audio enthusiasts, the package includes top/bottom covers, 8 screws, 5 knob caps, screwdriver, and power adapter for easy assembly. Equipped with a 45×15×10mm heatsink and built-in protection against short circuit, over-current, over-temperature, and reverse polarity for safer operation.
The ZK-MT21 is positioned primarily for entry-level home theater setups, desktop multimedia speakers, car audio upgrades, and DIY audio projects. While it may not meet the demands of those seeking ultimate audio fidelity, a pristine noise floor, or a professional-grade acoustic experience, it is a highly practical and cost-effective choice if you simply want to assemble—on a limited budget—a feature-rich, clear-sounding audio system that includes a dedicated subwoofer.
