1. Use high-quality materials for durability 2. Use dedicated inductors for digital power amplifiers: high current, low magnetic loss, small parasitic capacitance, low heat generation, use oxygen free copper wire to improve sound quality; The magnetic shielding mechanism has strong anti electromagnetic interference EMI performance 3. Use high-quality heat dissipation fans: reduce the overall temperature of the module and prevent it from hot; Heat dissipation for power supplies, amplifier chips, and filter capacitors, reducing temperature rise and its impact on sound quality, ensuring long-term stable operation of components 4. The mid range is clear and transparent, and supports the installation of -AMP 5. Wide application range, suitable for various industrial DIY occasions Parameters: Product name: 21 channel Bluetooth audio amplifier module Product model: -HT21 2G Bluetooth version: 5.0 (unobstructed, 15 meters) Input : AUX+Bluetooth+USB (dial button to switch mode and song) Number of channels: 2.1 channels (left channel+right channel+subwoofer) Power amplifier chip: TDA7498E Adapted power supply: DC15-36V (undervoltage protection 9V, can also support 12V power supply) Adapted speaker: 30-200W, 4-8 Output power: left and right channels 160W Subwoofer 220W Protection mechanism: anti reverse connection, undervoltage, overheating, overcurrent, short circuit protection Tip: Only when the audio signal input is large enough and the power supply voltage/current is large enough can there be sufficient output power! The higher the power supply voltage, the greater the output power, the smaller the horn impedance, and the greater the output power! Please that the power of the adapter power supply is the actual working power ofthe amplifier! Style: B: (HT21 second generation all-in-one, the shell needs to be installed) Material: Metal+Plastic colour: black Package Contents: 1 x Audio amplifier board 1 x Accessory combination Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.