ZK-HT21 Bluetooth 5.0 Digital Amplifier Module – 2.1 Channel Hi-Fi Audio Board with TDA7498E Chip, 160W x 2 + 220W Output, and Treble/Bass Subwoofer Control

Product Description

Experience a massive audio upgrade with the ZK-HT21 Bluetooth Digital Amplifier Module. This high-power 2.1 channel board utilizes the legendary TDA7498E chips to deliver a combined peak power of 540W (160W per stereo channel and 220W for the subwoofer). At Robogears, we recommend the ZK-HT21 for its incredible clarity and deep, punchy bass response. The board features an intuitive five-knob control system, allowing you to fine-tune the master volume, L/R treble and bass, and dedicated subwoofer frequency and volume. With support for Bluetooth 5.0, AUX input, and even USB flash drive playback, it is the ultimate foundation for building your own high-fidelity home theater or outdoor speaker system at your Pimpri facility.

Detailed Key Features

• Audiophile-Grade Power: Features dual TDA7498E high-performance Class D chips for ultra-low distortion and efficient power delivery even at high volumes.

• Full Audio Customization: Independent knobs for Subwoofer Frequency (20Hz–200Hz) and Subwoofer Volume allow you to blend your low-end perfectly with your stereo speakers.

• Advanced Bluetooth 5.0: Ensures a stable, low-latency wireless connection with a transmission range of up to 15 meters in open environments.

• Multi-Input Flexibility: Seamlessly switch between wireless Bluetooth, 3.5mm AUX input, or play high-quality lossless files directly from a USB drive.

• Rugged Safety Circuitry: Built-in safeguards against over-current, short-circuits, and thermal runaway ensure the longevity of your speakers and the amplifier itself.

Prototyping & Engineering Tips (Robogears Exclusive)

• Power Choice: To reach the full rated 540W output at your Pimpri workshop, you MUST use a high-current power supply. We recommend at least 32V 10A. Using a standard 12V or 19V laptop adapter will significantly limit the bass performance and overall volume.

• Speaker Pairing: For the best soundstage, pair this with 4-inch to 6.5-inch mid-bass drivers for the stereo channels and a dedicated 8-inch or 10-inch subwoofer.

• USB Format: When using a USB drive, ensure it is formatted to FAT32. The board supports most common formats like MP3, WAV, and FLAC for high-fidelity playback.

• Antenna Tip: If you find the Bluetooth range is short within a metal enclosure, you can solder an external IPEX antenna to the small U.FL connector on the PCB to boost the signal.

Package Includes

• 1 x ZK-HT21 Digital Amplifier Board

• 1 x Protective Acrylic Top & Bottom Shell Set

• 1 x Screwdriver & Mounting Accessories

• 5 x Aluminum Alloy Knobs

Image Disclaimer

Product images are shown for illustrative purposes only. The branding on the PCB or the specific color of the heatsink may vary based on the latest import batch, but the TDA7498E 160W*2+220W technical specifications remain as described.