Hosyond ZK-HT21 2.1 TDA7498E Bluetooth Amplifier

Hosyond ZK-HT21 is a 2.1-channel amplifier board that delivers two 160W stereo channels plus a 220W subwoofer output with Bluetooth, AUX and USB inputs and adjustable treble and bass.

This compact power amplifier module combines a TDA7498E class-AB power stage with modern connectivity and hardware tone controls for DIY speakers, desktop hi‑fi builds, and compact home audio systems. Designed to accept DC15–36V supplies and to drive 4–8Ω loudspeakers from 30–200W, the ZK-HT21 balances raw output capability with protection features such as reverse-polarity, overcurrent, overtemperature, short-circuit, and undervoltage safeguards.

How do I connect music sources to the ZK-HT21?

The ZK-HT21 supports three input methods so you can switch between sources without swapping hardware. A rotary dial on the board lets you select Bluetooth pairing, a wired AUX line-in, or USB audio playback easily.

• Bluetooth: wireless audio from phones, tablets, and computers.
• AUX: 3.5mm or RCA line-level connection for legacy devices.
• USB: direct playback from supported USB flash media (board-dependent codec support).
• On-board dial: quick input switching and basic playback control.

What output power and speaker types can I use with this amplifier?

This module provides two high-power channels and a dedicated sub output, making it suitable for a 2.1 speaker configuration that wants punch and clarity. It’s intended to drive speakers rated roughly 30–200W with 4–8Ω impedance for optimal performance.

• Left/right channels: up to 160W each (depending on supply voltage and speaker load).
• Subwoofer output: up to 220W for low-frequency extension.
• Best used with 4–8Ω drivers; avoid lower impedances to prevent stress on the amp.
• Match speaker power ratings to supply voltage for reliable output.

What power supplies and protections does the board require?

The ZK-HT21 accepts a broad DC input range and includes multiple safety systems to protect both the board and connected speakers. It works well with higher-voltage DC supplies for peak power while protecting itself if voltage falls too low.

• Supported input: DC 15–36V; optional operation down to 12V for lower-power setups.
• Undervoltage protection triggers below about 9V to avoid unstable operation.
• Built-in safeguards: anti-reverse polarity, overcurrent, overheating, and short-circuit protection.
• Use a quality DC adapter rated for sustained current to reach advertised outputs.

How can I control tone and tailor sound to my room?

The module includes physical treble and bass adjustment controls so you can shape the tonal balance without adding extra DSP hardware. These knobs let you boost or cut frequencies quickly while auditioning speaker placement or room treatment changes.

• Treble control: refine high-frequency clarity and air.
• Bass control: increase sub punch or reduce boominess to suit the room.
• Instant results: adjustments are analog and immediate for quick tuning.
• Combine with speaker placement and crossover tuning for best sub integration.

Who is this for? The Hosyond ZK-HT21 is aimed at hobbyists, DIY audio builders, and small-system integrators who need a compact, powerful 2.1 amplifier with modern inputs and hands-on tone control. If you want to build a bookshelf or desktop 2.1 system, upgrade an old active setup, or add a high-current sub amp to a custom enclosure, this board gives flexible connectivity, robust protection, and high output in a straightforward package.