brand new and high quality This amplifier features original IRS2092, IRFB23N20D. Electrolytic capacitor signal main loopfeatures imported brands, main filter capacitors feature 4700uf/80V ones 4 pcs, features dual rectify 25*2(50A) rectifying bridge, ensure powerful and steady power supply. Resistors featurs metal ones, main loop features 1% accuracy metal film resistors, ensure the good S/N ratio. PCB features 1.6mm thick double-sided board, 2.0 Oz copper thickness, spray tin process. ensure full currency's good passing performance. first class quality. Features 20A big currency shielding inductance, deliver crisp and powerful sound. The whole circuit board's wiring and layout is very reasonable and compact, whole PCB's wiring features one point ground style. the amplifier board's working ability is steady and reliable, with big output power; the sound is exquisite and smooth, with open sound field. the 3D sense is strong, iscalm, solid and strong, Sound Noise Ratio and dynamic is excellent; details is clear,Transient Responseis good. Suitable for playing all kinds of music. Specifications: Voltage range: AC dual 20V-50V (rectifier voltage (+28V-70V). Note that when the voltage is below 35V, R6 R7 is converted to 2K/2W resistor. (Delivery default voltage 40-45V, R6 R7 3.9K) Maximum output power: 350W/8 AC double 50V power supply, distortion 100dB