Feature:1. High Performance: Using the TPA3116 high performance digital power amplifier chip as the core, parallel bridge bass channel power amplifier, support 100W (bass channel) output.2. Multi Function: This amplifier board with external sound input interface, with preamplification, bass crossover processing, bass volume, bass frequency, switch, total volume, 2 adjustment potentiometers.3. Power Supply: Use DC single power supply 1224V powered, power saving, efficiency is as high as 90 percent or more. Can use great performance switch power supply, laptop switch power supply or charging battery, car power supply, etc.4. Easy To Use: The subwoofer amplifier board has been welded and tested, connected to the speaker box, connected to the appropriate power supply, correctly connected to the sound input can be used.5. Premium Material: This digital mono amplifier module is made of premium PCB material, stable and reliable, can be used for a long time, very suitable for DIY speakers, etc.Specification:Item Type: Subwoofer Amplifier BoardMaterial: PCBSize: Approx. 84 x 55 x 13mm or 3.3 x 2.2 x 0.5inVoltage: 12-24VPower: 100WColor: Black.Package List:1 x Subwoofer Amplifier Board1 x Screw Pack1 x Connector CableNote:Manual measurement, please allow some errors.