ZK-ST21 2.1 Channel Bluetooth Amplifier Board – 100W+100W+200W – Wuzhi Audio Bangladesh

ZK-ST21 Bluetooth Digital Amplifier Board – 2.1 Channel 100W + 100W + 200W Subwoofer (TPA3221)

The ZK-ST21 is a premium-quality 2.1 Channel Bluetooth Digital Amplifier Board designed for those who demand high-power, crystal-clear audio performance. Featuring the advanced Texas Instruments TPA3221 Class-D amplifier chip, this board delivers 100W RMS per stereo channel and 200W RMS for the dedicated subwoofer channel — giving you powerful, distortion-free sound for your home theater, multimedia, or DIY speaker projects.

With Bluetooth connectivity, you can stream your favorite music directly from your phone, tablet, or computer without the need for extra cables. For those who prefer wired options, the ZK-ST21 also supports AUX input, USB playback, and sound-card input, making it compatible with almost any audio source.

The TPA3221 chipset ensures high efficiency and low heat generation, while built-in protection features — including over-current, over-temperature, reverse-polarity, and short-circuit protection — guarantee safe, long-lasting operation. Its compact PCB design makes it ideal for integration into custom enclosures or professional speaker systems.

Whether you are an audiophile, hobbyist, or professional installer, the ZK-ST21 delivers unmatched power and sound quality in its class. Available exclusively from Wuzhi Audio Bangladesh, the authorized seller in Bangladesh, this amplifier board is offered at special wholesale prices for retailers and bulk buyers.

Key Features

• Output Power: 100W (Left) + 100W (Right) + 200W (Subwoofer) RMS

• Amplifier Chip: TI TPA3221 Class-D high-efficiency chipset

• Channels: 2.1 (Stereo + Subwoofer)

• Input Options: Bluetooth, AUX, USB, Sound Card

• Audio Quality: Low distortion, high signal-to-noise ratio

• Power Supply: DC 12V–24V recommended for optimal output

• Protection: Over-current, over-temperature, reverse-polarity, short-circuit

• Use Cases: Home theater, multimedia systems, DIY speaker builds, professional sound setups

• Seller Info: Available from Wuzhi Audio Bangladesh – Authorized Seller in Bangladesh, wholesale price available for bulk purchase

Wuzhi Audio Bangladesh is your trusted source for original Wuzhi products in the local market. By purchasing from the official channel, you ensure authentic performance, long service life, and factory-level quality control.

📦 Wholesale inquiries are welcome — retailers, resellers, and installers can enjoy special bulk rates on all Wuzhi Audio products.