The ZK-TB21 Hi-Fi Stereo Amplifier is a powerful 2.1 channel Class D audio amplifier module designed for high-quality stereo and subwoofer output. Featuring Bluetooth 5.0 connectivity, it allows seamless wireless audio streaming from smartphones, laptops, and other Bluetooth-enabled devices.

With an output of 50W × 2 for left and right channels and an additional 100W subwoofer output, this amplifier delivers deep bass and clear stereo sound. Equipped with dedicated controls for volume, bass, treble, and subwoofer level, it offers full control over your audio experience.

Compact, efficient, and easy to integrate, the ZK-TB21 is ideal for DIY speaker systems, home audio setups, and subwoofer-based sound projects.

Features

• 2.1 channel audio output (stereo + subwoofer)
• Output power: 50W × 2 + 100W subwoofer
• Built-in Bluetooth 5.0 wireless audio
• High-efficiency Class D amplifier design
• Independent bass, treble, and subwoofer control
• Volume control knob with smooth adjustment
• Low distortion and high audio clarity
• Compact and lightweight PCB design
• Supports AUX input (model dependent)
• Suitable for 4Ω–8Ω speakers

Specifications

• Model: ZK-TB21
• Channels: 2.1 (Left + Right + Subwoofer)
• Output Power:
  • Left/Right: 50W × 2
  • Subwoofer: 100W
• Bluetooth Version: 5.0
• Amplifier Type: Class D
• Input Voltage: DC 5V – 24V (recommended 12V–24V)
• Speaker Impedance: 4Ω – 8Ω
• Controls: Volume, Bass, Treble, Subwoofer level
• Efficiency: >90% (typical)
• Protection: Overcurrent, overheating, short circuit (varies by version)

Applications

• DIY 2.1 speaker systems
• Home theater audio setups
• Bluetooth speaker projects
• Subwoofer amplifier systems
• Car and portable audio systems
• PC and TV sound enhancement
• Workshop and entertainment setups