Sigllr ZK-HT21 Bluetooth 5.1 2.1 Channel Amplifier Board – 160W×2 + 220W Sub for Home & Car Audio Upgrade

Introducing the Sigllr ZK-HT21: a compact, feature-rich amplifier board for DIY speakers and car audio

The ZK-HT21 is designed to fit into tight spaces while delivering a versatile 2.1 channel setup. It supports a wide 12–24V DC input, maintains a steady Bluetooth 5.1 connection up to about 15 meters, and offers an auxiliary input for wired sources. Independent knobs let you tailor treble, bass, and subwoofer output, giving you the flexibility to fine-tune sound for different rooms or rides without swapping components.

Key capabilities and performance at a glance

• 2.1 channel stereo with dedicated main amps and a powerful subwoofer channel for deep, controlled bass.
• Bluetooth 5.1 with up to 15 meters of wireless range for casual listening without cables.
• AUX input plus independent tone controls to shape high, mid, and bass frequencies.
• High-efficiency design using the TDA7498E chip and shielding to minimize noise and distortion.
• Ultra-compact footprint (0.6 × 3.9 × 3.5 inches) with a robust heatsink and built-in cooling fan.
• 4-in-1 protection against over-voltage, under-voltage, short-circuit, and overheating for safer operation.
• All-in-one kit includes power cord, mounting screws, cables, and a detailed manual for quick setup.

In practice, you may experience crisp highs, balanced mids, and a convincing deep bass response that can elevate everyday listening, movie moments, or in-car audio without requiring a full new stereo system. The design emphasizes reliability and ease of use, so you can explore upgrades with confidence, knowing the board is built to integrate with standard passive 4–8Ω speakers and common power supplies.

Real-life use cases

• Home theater and stereo upgrades for existing bookshelf or floorstanding speakers with a compact, shielded module.
• Car audio enhancements thanks to the wide 12–24V input range and integrated sub output for stronger bass in small spaces.
• DIY speaker projects where space, heat management, and protection features matter for long-term projects.
• Multimedia setups in small studios or compact workstations requiring clear treble and solid bass response.

What you gain is a robust building block that invites experimentation with sound. While results depend on your speakers and environment, the ZK-HT21 offers a dependable path to more expressive audio without committing to a heavier or more complex system.

What’s in the box

• Original power cord
• Mounting screws
• Connection cables
• Detailed user manual
• Plug-and-play ready for quick installation