Main parameters:Power supply: DC 6.5-15V (depending on the required output power), power adapter, switch mode power supply, battery can be used, and it is recommended to use a current of 3A or above.Bass output power: maximum 25W, it is recommended to use a 4-6 inch, 4-6 ohm, 20-50W subwoofer.Left and right channel output power: 6W+6W, it is recommended to use a 2-4 inch, 4-8 ohm, and 3-25W full frequency speaker.The above power requires a power supply of around 13.5V.The left and right channels use the low-power audiophile grade audio dedicated chip TDA1517P as the output stage, truly providing high-quality effects.PCB material: FR-4 fiberglass board, thickness: 1.6mm.Board size: 63x45x20mm (length x width x height), excluding potentiometer handle length. Potentiometer axis distance: 24mm. The diameter of the potentiometer mounting hole needs to be 7mm.Input interface: 3.5mm socket.Packaging includes1 * Power amplifier board