About this item Small volume digital class D high fidelity 2.1 channel subwoofer 12V audio amplifier board, widely used in home TV audio, car speakers, multimedia audio, computer desktop audio speaker, and advertising machine etc. PCB material: FR-4 fiberglass board, thickness: 1.6mm. Onboard fixing hole diameter: M3; The left and right channels use a low-power enthusiast audio dedicated chip TDA1517P as an output stage, which really provides high quality results. Power input: DC 6.5-15V (depending on the required output power), e.g., power adapter, switching power supply, battery, etc. [In order to obtain a more shocking effect, suggest power supply voltage larger than 13.5V DC], the recommended current is more than 3A. Power interface is 5.5*2.1 DC socket or pad of welding wire; Audio input interface: 3.5mm plug or pad of welding wire; Left and right channel output power: 6W+6W, it is recommended to use 2-4 inch, 4-8 3-25W full-range speaker; Bass output power: maximum 25W, it is rec