High Power 2.1-Channel Audio Amplifier | ZK-HT21 Bluetooth 5.0 Board with 2×160W+220W Sub Output & Multi-Input (AUX/USB)

Key Advantages

1. High-Power 2.1-Channel Output
   • Delivers 2×160W RMS (4Ω) for left/right channels and 220W RMS (4Ω) for subwoofer, powered by the TDA7498E dual-bridge amplifier chip, ensuring deep, impactful bass without distortion.
2. Bluetooth 5.0 with 15m Range
   • Stream audio wirelessly from smartphones, tablets, or laptops with stable connectivity (no obstructions) up to 15 meters, supporting A2DP/AVRCP profiles for seamless playback control.
3. Multi-Input Flexibility
   • Switch between AUX (3.5mm jack), Bluetooth, and USB (MP3/WAV playback) via rotary dial + buttons, eliminating the need for external mixers or adapters.
4. Wide Power Supply Compatibility
   • Operates on DC 15V–36V (supports 12V with reduced output) and includes under-voltage protection (<9V), making it suitable for car batteries (12V), desktop power supplies (19V/24V), or DIY battery packs.
5. Universal Speaker Compatibility
   • Drives 30W–200W, 4Ω–8Ω speakers (left/right + subwoofer), ideal for upgrading factory car speakers, building home theater systems, or pairing with high-efficiency bookshelf/tower speakers.
6. Comprehensive Protection Circuitry
   • Features reverse polarity, under-voltage, overheating (>85°C), over-current, and short-circuit protection to safeguard the amplifier and connected speakers from damage.
7. Compact & Durable Design
   • PCB dimensions: 145×126×28mm, net weight: 327g, with gold-plated terminals for secure wire connections and aluminum heatsink for efficient thermal dissipation.
8. Plug-and-Play Setup
   • Requires no software installation—simply connect power, speakers, and input source to enjoy instant 2.1-channel audio with adjustable bass/treble (via external EQ if needed).

Technical Specifications

• Model: ZK-HT21
• Bluetooth Version: 5.0 (Class 2, 15m range)
• Input Modes: AUX (3.5mm) | Bluetooth | USB (MP3/WAV playback)
• Channels: 2.1 (Left + Right + Subwoofer)
• Amplifier Chip: TDA7498E (Dual-Bridge)
• Output Power:
  • Left/Right: ≤160W RMS (4Ω, 1kHz, THD=1%) | ≤100W RMS (8Ω)
  • Subwoofer: ≤220W RMS (4Ω, 100Hz, THD=1%) | ≤150W RMS (8Ω)
• Power Supply: DC 15V–36V (Recommended: 24V–36V for full power)
• Speaker Impedance: 4Ω–8Ω
• SNR: ≥98dB (A-weighted)
• THD+N: ≤0.03% (1W, 1kHz)
• Protection: Reverse Polarity | Under-Voltage (<9V) | Overheat (>85°C) | Over-Current | Short-Circuit
• Dimensions: 145mm (L) × 126mm (W) × 28mm (H)
• Weight: Net 327g | Packaged 395g

Target Applications

1. Car Audio System Upgrades
   • Replace factory amplifiers to power aftermarket 6.5-inch speakers (left/right) and 8-inch/10-inch subwoofers, delivering cinema-like bass for music or movies during drives.
2. Home Theater Bass Enhancement
   • Add a dedicated subwoofer channel to existing 2.0 or 5.1 systems, improving low-frequency response for explosions in action films or deep synths in electronic music.
3. DIY Desktop/Gaming Audio
   • Build a compact 2.1-channel gaming setup by pairing with bookshelf speakers + subwoofer, enhancing immersion in FPS games (footsteps) or RPGs (environmental sounds).
4. Portable Party System
   • Combine with a 12V battery pack and collapsible speakers for outdoor events (e.g., picnics, beach parties), streaming music via Bluetooth while powering a 10-inch subwoofer.
5. Educational/Experimental Projects
   • Study Class-D amplifier design, Bluetooth audio protocols, or speaker protection circuits by modifying the ZK-HT21’s components (e.g., replacing capacitors for extended bass response).
6. Commercial Audio Installations
   • Power subwoofers in restaurants, retail stores, or gyms where deep bass is needed for background music or motivational workout tracks, with protection against power surges.
7. Studio Monitoring Subwoofer
   • Create a low-cost reference subwoofer for music producers to check low-end balance in mixes, ensuring kick drums and basslines translate well across consumer speakers.
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