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Green rectangular circuit board with silver heatsink, black connectors and blue Bluetooth antenna, 120 by 100 mm

ZK-TB21 Amplifier Board 50W+50W+100W 2.1 Channel Subwoofer Amp Board with Treble

SKU CH-H8PT-CG137

A 2.1-channel Bluetooth 5.0 amplifier board delivering 50 W per speaker and 100 W to a subwoofer from a 12–24 V supply

  • 1 channel drives two speakers plus a subwoofer for immersive sound
  • Dual TPA3116D2 chips deliver ultra-low distortion below 0.1% for high fidelity
  • 50W per channel and 100W subwoofer output powers 4-8 ohm speakers
  • Bluetooth 5.0 and 3.5mm AUX inputs with 10 metre wireless range
  • Extra-large heat sink plus short-circuit and overheat protection ensures reliable operation

2.1-Channel Subwoofer Amplifier Board

The ZK-TB21 is a Class D amplifier board designed for DIY speaker builders who want a compact 2.1-channel solution. It integrates dual TPA3116D2 chips to drive left and right satellite speakers plus a dedicated subwoofer channel. Bluetooth 5.0 and a 3.5 mm AUX input provide wireless and wired connectivity for home audio projects.

Sustained High-Power Thermal Performance

An extra-large 50*25*10 mm heat sink dissipates heat during continuous high-power output, preventing the amplifier chips from overheating. Protection circuits include reverse-connection, short-circuit and self-recovery overheat safeguards that maintain stable operation under prolonged load. Maximum output reaches 50W per satellite channel and 100W for the subwoofer with distortion below 0.1%.

Power Supply and Speaker Compatibility Check

Verify your DC power supply delivers 12 V to 24 V at 5 A or above to meet the board’s input requirements. Ensure satellite speakers are rated 20 W to 200 W at 4 Ω to 8 Ω and the subwoofer is rated 20 W to 100 W at the same impedance range. Remember that AUX input only functions when Bluetooth is disconnected.

Highlights

  • 1 channel drives two speakers plus a subwoofer for immersive sound
  • Dual TPA3116D2 chips deliver ultra-low distortion below 0.1% for high fidelity
  • 50W per channel and 100W subwoofer output powers 4-8 ohm speakers
  • Bluetooth 5.0 and 3.5mm AUX inputs with 10 metre wireless range
  • Extra-large heat sink plus short-circuit and overheat protection ensures reliable operation

Specifications

No published specifications for this item yet.

Questions about this item

Does the ZK-TB21 board overheat when running at 50W+50W+100W all day?

The extra-large 50*25*10 mm heat sink provides continuous dissipation for high-power output, and self-recovery overheat protection shuts the chip down safely if temperatures climb too high.

What power supply and speakers do I need before this amplifier will work?

A DC 12 V–24 V supply rated at 5 A or more, plus two passive speakers (20–200 W, 4–8 Ω) and one subwoofer (20–100 W, 4–8 Ω).

Can I keep my old 3.5 mm AUX source and still use Bluetooth 5.0 on the same board?

Yes — the board accepts both Bluetooth 5.0 and 3.5 mm AUX inputs; Bluetooth takes priority, so disconnect the BT link first if you want AUX playback.

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