Fangrui Product Details One Input And Four Output, Each Output Volume Is Independently Controlled. Built-in Mcu Control Circuit, Control Of The Impact Sound Of The Power-off, Static Effect Of The Switch. With A 10db, Gain Switch, You Can Increase The Following Volume, Add The Level To The Device With Lower Output Level, Increase The Volume Frequency Response 20-20khz +/- 0.1db, Distortion 0.0 Output Phase And Input Phase Are The Same Each Channel Is Independently Processed By An Op Amp, And Does Not Interfere With Each Other. The Machine Is Equipped With Tis Ne5532. The Buyer Can Different Op Amps According To Their Own Preferences. The Op Amp Supply Voltage Is +/- 12v; The Op Amp Is Positive. Ling Jinggong Produces Gold-plated Sockets With Good Contact And Resistance To Plugging Solid-state Filter Capacitor, Stepless Audio Coupling Capacitor, Tk Audio Audio Coupling, Extremely Fever Gold-plated Rca Socket, Good Contact, Brushed Aluminum Casing, Laser-engraving, High-grade, Beautiful, Atmospheric Power S