The bass of this power amplifier board is strong and powerful, the sound is loud enough, and it is shocking!!! It is definitely enough for ordinary home use!!! The material is solid, the material is excellent, it is very heavy, there is no impact sound, it will not hurt the horn, the bottom noise is well controlled, the sound is comfortable, and the heat sink part is strengthened than before. This power amplifier board uses high-quality materials, the quality of workmanship is clearly visible, the layout is clean and tidy, and it is very neat There is insulation between the power amplifier chip and the heat sink. When you modify the heat sink by yourself, pay attention to the insulation treatment and be careful of the power supply short-circuit, otherwise the chip will be burned out. Do not use your hands when working. This is a welded finished module. The tested finished power amplifier board uses a transformer to supply power. Do not connect additional rectifier and filter modules. Our power amplifier board comes with rectifier and filter. Our power amplifier board uses dual bridge rectifiers to provide power. Balanced output in bridge current sharing mode is more stable! Product name: TDA2030A two-channel stereo power amplifier board Product power: 2X15W (TDA-2030A) Working voltage: transformer 9V-12V Drive capability: It is recommended to use a 3-inch 4-inch full-range speaker for the left and right channels, with an impedance of 4ohm-8ohm colour:Black Material:PCB size:76 x 67 x 47mm Package Contents: 1 x TDA2030A Pure Power Amplifier kit Only the above package content, other products are not included. Note: Light 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.