AEXCVG ZK-HT21 Bluetooth Amplifier Board | 160W×2 + 220W Subwoofer 2.1 Channel | AUX/Bluetooth/USB

Overview

The AEXCVG ZK-HT21 Bluetooth Amplifier Board is a compact 2.1 channel solution designed to bring passive speakers to life. With 160W per channel on the left and right channels and a dedicated 220W subwoofer output, the board provides ample headroom for engaging music and movie moments in small to medium rooms. Built for versatility, it accepts multiple inputs and offers a straightforward way to upgrade a passive speaker setup without needing active speakers.

Key Inputs and Easy Source Switching

Designed for flexible wiring, the board integrates AUX, Bluetooth 5.0, USB, and Subwoofer inputs. A standard 3.5 mm AUX input lets you connect cell phones, laptops, or TVs. Bluetooth 5.0 enables quick pairing within a typical 10 m to 32 ft range, while USB input supports media play from flash drives. Note: when using AUX mode, ensure the Bluetooth connection is disconnected to avoid signal conflicts.

• 3.5 mm AUX input for common devices
• Bluetooth 5.0 for wireless streaming
• USB input for direct media playback
• Dedicated subwoofer channel for enhanced bass

Power, Protection, and Reliability

Two imported TDA7498E chips deliver the main amplification, with a 2.1 channel format that supports a substantial listening experience. The board operates with a DC power range of 15–36V (undervoltage protection below 9V) and includes several safeguards to guard against common issues. If overload or abnormal conditions occur, the protection system helps protect the module and connected speakers.

• Overvoltage and undervoltage protection
• Overheating and short-circuit safeguards
• DC detection to prevent improper startup

Speaker Compatibility and Setup

The ZK-HT21 is designed for passive speakers in the 30–200W range with 4–8 Ω impedance. This makes it suitable for a variety of bookshelf or floorstanding speakers, enabling you to tailor the system to your room size and listening preferences. It does not natively drive Bluetooth or active speakers, so pairing decisions should consider passive speaker configurations and a compatible power supply.

What You Can Expect in Real Use

In real-world setups, this board shines as a space-saving upgrade for a home theater, a dedicated music corner, or a DIY speaker project. The multifunctional control layout makes it approachable for enthusiasts who want a direct path from source to sound, with quick input selection and volume adjustments. The combination of a strong left-right pair and a dedicated subwoofer channel helps create a fuller soundstage, from crisp dialogue to immersive bass tones.

Usage Tips

Connect a DC power supply within the specified range, wire your passive speakers to the outputs, and use the dial to switch inputs and control playback. If you switch to AUX, disconnect Bluetooth first to ensure clear audio transfer. This board is aimed at passive speaker users seeking a reliable, configurable amplification solution without incorporating Bluetooth-enabled speaker models.