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PowerChord Lab

ZK-HT21 2.1 channel Bluetooth 5.0 Subwoofer Amplifier Board

ZK-HT21 2.1 channel Bluetooth 5.0 Subwoofer Amplifier Board

β‚±866.00 PHP
β‚±1,296.00 PHP β‚±866.00 PHP
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Product Name: 2.1 channel audio amplifier module with Tone

Product Model: ZK-HT21

BT Version: 5.0 (no shielding, 15 meters)

Audio Input: AUX + BT + USB (Dial wheel button toggles song and mode)

Channel: 2.1 (Left channel + right channel + subwoofer)

Chip Solution: TDA7498E

Adaptive power supply: DC 15~36 V (Under voltage protection below 9V, and 12V power supply can also be supported)

Adapter Speaker: 30-200W, 4-8Ξ©

Current: 6A and above

Output Power: Max 160W @ R&L channel

Max 220W @ subwoofer

Protection Mechanism: Anti reverse connection, undervoltage, overheating, overcurrent, short circuit protection

Product Size: 145*126*28mm

Product weight: net weight 327g, package weight 395g

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πŸ” ZK-HT21 Quick Facts:

    1. πŸ”Š Delivers up to 540W Total Power (160Wx2 + 220W) for powerful audio output.
    2. πŸ“Ά Bluetooth 5.0 offers faster, stable, and longer-range wireless connection.
    3. πŸ”Œ Supports DC 15V–36V – works with a wide range of power supplies.
    4. 🎧 2.1 Channel Design – supports stereo + subwoofer for full-range sound.
    5. πŸŽ›οΈ Independent bass, treble, and volume controls for custom sound.
    6. πŸ”§ Great for DIY builds – compact, open-board design fits many setups.
    7. πŸ› οΈ Built-in heatsink helps prevent overheating during long use.
    8. 🎢 Clear highs & deep bass – ideal for home theaters, speakers, or car audio.
    9. πŸ“² Quick Bluetooth pairing with phones, tablets, and laptops.
    10. πŸ’‘Plug & play ready – easy setup even for beginners.

πŸ”ŒWired Setup (DC Power + Speakers + Audio Source)

  • Power Supply Connection

    1. Use a DC power adapter (15V–36V)
    2. Connect the positive (+) and negative (–) wires to the DC IN terminals of the board.
    3. ⚠️ Make sure voltage and polarity are correct to avoid damage.

  • Speaker Connection

    1. Connect your Left (L) and Right (R) speakers to the output terminals marked L/R.
    2. Connect your to the SUB output terminals.


  • Audio Source Input (AUX Option)

    1. Use a 3.5mm AUX cable or RCA-to-AUX jack.
    2. Plug into the LINE IN/AUX port of the board.

  • πŸ“Ά Bluetooth Connection

    1. Power on the amplifier board using a DC power source.
    2. Turn on Bluetooth on your phone or device.
    3. Look for the board’s name (e.g., β€œBT-Audio” or similar).
    4. Tap to pair β€” once connected, you’re ready to play audio wirelessly!

  • πŸŽ›οΈ Control Audio

    1. Use the Volume, Bass, and Treble knobs to fine-tune your sound
    2. Subwoofer level is also adjustable separately.