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  3. ZK-TB21 2.1 Channel Bluetooth 5.0 High-Power Digital Amplifier Board โ€“ 50W+50W Stereo & 100W Subwoofer Output with Bass/Treble/Volume Control
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Pricelist: Retail Price (B2C) Pricelist
ZK-TB21 2.1 Channel Bluetooth 5.0 High-Power Digital Amplifier Board โ€“ 50W+50W Stereo & 100W Subwoofer Output with Bass/Treble/Volume Control

ZK-TB21 2.1 Channel Bluetooth 5.0 High-Power Digital Amplifier Board โ€“ 50W+50W Stereo & 100W Subwoofer Output with Bass/Treble/Volume Control

SpecificationDetails
ModelZK-TB21
Bluetooth Version5.0 (up to 10m range)
Output Power50W x 2 (Stereo) + 100W (Subwoofer)
Working VoltageDC 12V to 24V (5A or above recommended)
Audio InputBluetooth + 3.5mm AUX
Frequency Range20Hz โ€“ 30KHz
Speaker Impedance4ฮฉ โ€“ 8ฮฉ
                                 Price

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Barcode: 145641

Product Description

The ZK-TB21 utilizes high-quality power inductors and professional-grade capacitors to ensure clear sound even at high volumes. The board includes a massive integrated heatsink to manage thermal output during long listening sessions. It is designed for easy assembly, coming with an acrylic protective shell and high-quality aluminum knobs. The 2.1 configuration allows you to drive two full-range speakers for clarity and one dedicated subwoofer for deep, punchy bass.

Key Features

  • Dedicated Subwoofer Control: Fine-tune your bass experience by adjusting both the volume and the cutoff frequency of the subwoofer independently.

  • Bluetooth 5.0 Stability: Provides a reliable wireless connection with low latency, compatible with all modern smartphones and tablets.

  • Dual Input Support: Features both wireless Bluetooth and a physical 3.5mm AUX port for wired connections to PCs or TVs.

  • Professional Tone Tuning: Independent Bass and Treble knobs for the stereo channels allow for a fully customized soundstage.

  • Comprehensive Protection: Built-in safeguards against over-voltage, under-voltage, overheating, and short-circuits for long-term durability.

Technical Details

  • Dimensions: 118mm x 100mm x 22mm.

  • Power Efficiency: >90%.

  • Build Material: High-density PCB with gold-plated terminals.

Prototyping and Engineering Tips from Robogears

  • Power Supply Recommendation: For maximum performance (especially for the 100W subwoofer), use a 24V 6A to 10A DC power adapter. Using a 12V supply will significantly reduce the bass output and overall volume.

  • Subwoofer Matching: Pair this board with a 4-ohm or 8-ohm passive subwoofer. If the subwoofer "pops" at high volumes, your power supply likely isn't providing enough current.

  • Frequency Tuning: Use the Sub-Freq knob to set where the bass starts. For smaller speakers, set it higher (~150Hz); for larger floor-standing speakers, set it lower (~80Hz) to let the main speakers handle more of the mid-bass.

  • Cooling in Enclosures: If you are building this into a wooden speaker box, ensure there are ventilation holes or a small 12V fan, as the heatsink can become quite hot when pushing 200W total power.

Package Includes

  • 1 x ZK-TB21 Amplifier Board Module

  • 1 x Acrylic Shell Set (Top and Bottom)

  • 5 x Aluminum Knobs

  • Assembly Accessories (Screws, Standoffs, DC Jack Adapter)

Disclaimer

Always connect the speakers before applying power to the module. Ensure the DC power polarity is correct to avoid permanent damage to the amplifier chips.

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