Note: 1. The output power is related to the power supply voltage, speaker impedance, and sound source input size. Usually the higher the supply voltage, the higher the output power supported._x000D_2. Speakers with different impedances can support different output power. Typically, speakers have less power and are easier to implement._x000D_3. Components may vary slightly from batch to batch, but functional performance remains the same. Specification: Item Type: Amplifier Board_x000D_Material: PCB_x000D_Input Voltage: 12-24V_x000D_Output Power: 100W_x000D_Input Frequency: 20Hz-20KHz_x000D_Output Frequency: 20Hz-180Hz_x000D_Sound Input Sensitivity: 500mV_x000D_Subwoofer Impedance: 2-8 Features: 1[Multi Functional] Digital sound amplifier board is a subwoofer power amplifier board with preamplifier, bass crossover, bass volume potentiometer control. Suitable for DIY speakers. 2[Professional] Power amplifier board has a high performance digital power amplifier chip based on for TI TPA3116D2. Perfect for professionals who already own a 2.0 amplifier. 3[Efficient] Amplifier module adopts DC 12?24V power supply, wide operating voltage, power saving, and the efficiency is as high as 90%. Supports bass channel output up to 100W (Bass). 4[Multi Applications] Amp board for switching power adapters with good performance, notebook switching power supplies, rectifier filter transformer power supplies, charging or vehicle power supplies, etc. 5[Stable Performance] Digital sound power amplifier module adopts high quality PCB materials and components to ensure stable performance. Easy to install and use. PackageList: 1 xAmplifier Board 1 x Adapter Cable 2 x Knob Cover 2 x Gasket 2 x Nut