Using TAS5630, OPA1632DR, TL072 The electrolytic capacitor adopts a capacity of 470UF/100V x 4 to strong and continuous . The resistance is a five-ring metal resistor, and the main circuit uses a five-ring metal film resistor with an accuracy of 1%, ensuring a good signal-to-noise ratio of the whole machine. Use fully shielded high-current inductors to crisp and powerful sound. PCB adopts 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and full tin spraying process to good passing performance of large and small currents. Top- PCB quality. Basic parameters: 1. Working : Category D 2. Quiescent current: 65mA 3. Work efficiency: 88% 4. Output power: 300W+2 x 150W/4 ohms 10% 5. Frequency response: 20Hz to 20KHz 6. Dynamic range: 100 dB 7. Signal-to-noise ratio: 100dB(A-Weighted) 8. Working voltage: DC48V 9. PCB size: 150 x 95MM 10. Potentiometer function: from left to right 1. Subwoofer volume 2. Left and right channel treble 3. Left and right channel volume 4. Total volume 11. Potentiometer spacing: 22MM x 22MM x 30MM Weight: 380g Material: abs Color as shown Package Contents: 1 x Digital 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.