1. Using laser dark text TDA7294 2. The power filter adopts 6 capacitors, and the rectifier adopts 25A rectifier flat bridge. 3. The PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tin spraying process to good passing performance of large and small currents. 4. Fully enclosed dust-proof potentiometer is adopted, the performance is more stable, and it is more than ordinary potentiometer! 5. Fever component assembly, the subwoofer part is composed of two TDA7294 BTL output, low-pass filter is designed according to home theater-style frequency adjustable design (50-150HZ), strong power! The left and right channels are served by two TDA7294 respectively, and the input coupling capacitor adopts the WIMA 2.2UF coupling capacitor from Germany, the sound is sweeter! Power supply: dual 18-26V AC Power: 2x80W 160W subwoofer Circuit board size: 218x98MM Potentiometer function:low frequency frequency adjustment, subwoofer volume. Left and right channel volume, treble, bass. Note:there are slight differences in motherboard accessories, which not affect the application. Color:Red Material:ABS Package Contents: 1 * TDA7294 Amplifier Board Only the above package content, other products are not included. Note: Light reflection 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.