XH-M422 TPA3116D2 Bluetooth 4.0 Amplifier Board 50W×2 DC 12-24V Dual Channel Audio Module with USB TF Card Player

Product Description XH-M422 all-in-one digital amplifier board adopts high-performance TPA3116D2 Class D chip, integrating Bluetooth 4.0 receiver, USB flash drive and TF card player functions. It delivers 50W×2 stereo output with over 90% high efficiency, featuring low heat generation and stable performance. With complete button control and wide voltage input range, it is perfect for building DIY Bluetooth speakers, upgrading old audio systems, home theater setups and car audio modification projects.

Technical Specifications - Model: XH-M422 - Main Chip: TPA3116D2 - Bluetooth Version: 4.0 - Bluetooth Transmission Distance: Up to 20 meters (open space without obstacles) - Power Supply: DC 12V-24V - Output Power: 50W×2 Dual Channel Stereo - Supported Speaker Impedance: 4Ω-8Ω - Frequency Response: 14Hz-100KHz - Amplifier Efficiency: >90% - Input Modes: Bluetooth 4.0 / USB Flash Drive / TF Card - Control Method: 4 integrated function buttons - Product Size: 73×68×16mm - Net Weight: 45g

Core Advantages - ✅ Original TPA3116D2 Class D chip, clear and powerful sound quality - ✅ 3-in-1 input modes: Bluetooth + USB flash drive + TF card, meet various usage needs - ✅ 20 meters long Bluetooth transmission distance, stable connection without dropouts - ✅ Over 90% high efficiency, low heat generation, no additional heat sink required for normal use - ✅ Complete button control, supports mode switching, play/pause, track skipping and volume adjustment - ✅ Compact size, easy to install in various audio enclosures - ✅ Wide voltage input range, compatible with 12V and 24V power systems

Button Function Guide - **Mode Button**: Switch between input modes (Bluetooth / USB Flash Drive / TF Card) - **Play/Pause Button**: Play or pause music playback - **Previous / Volume Down Button**: Short press = Previous track; Long press = Decrease volume - **Next / Volume Up Button**: Short press = Next track; Long press = Increase volume

⚠️ IMPORTANT USAGE NOTES 1. Please use a stable DC 12V-24V power supply, do not exceed 24V to avoid damaging the module 2. Never short circuit the speaker output terminals to each other or to ground 3. Always connect speakers first before powering on the amplifier board 4. Format USB flash drive and TF card to **FAT32 file system** for normal playback 5. Actual Bluetooth transmission distance may be reduced by walls, metal objects or other obstacles

Applicable Scenarios - DIY Bluetooth bookshelf and floor-standing speakers - Upgrade old wired speakers to wireless Bluetooth - Home theater and multimedia audio systems - Car audio modification - Portable outdoor audio devices - Small commercial audio systems

Package List 1 × XH-M422 TPA3116D2 Bluetooth 4.0 Digital Amplifier Board with USB TF Card Player

Notes 1. Slight 1-2mm size deviation exists due to manual measurement 2. Item color may have minor differences influenced by different monitor displays and lighting conditions 3. For best performance, use speakers with power rating between 30W-80W