1. Use IRF240 IRF9240 Mos Tube. The Input Coupling Capacitor Is A 50V/3.3uF Weimar Capacitor From Germany, The Resistor Is A Five-Ring Metal Resistor, And The Main Circuit Uses A Five-Ring Metal Film Resistor With An Accuracy Of 1 percent , Ensuring A Good Signal-To-Noise Ratio Of The Whole Machine. 2. 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. Top- PCB Quality. 3. The Wiring Layout Of The Entire Circuit Board Is Quite Rigorous And Reasonable, And The Overall PCB Wiring Adopts A One-Point Grounding . This Power Amplifier Board Works Stably And Reliably, With High Output Power 4. The Sound Is Beautiful And Round, And The Sound Field Is Wide. Strong Three-Dimensional Effect, Stable And Powerful Low Frequency, Excellent Signal-To-Noise Ratio, And Wide Dynamic Range 5. The Details Are Clear And The Transient Response Is Excellent. It Can Play All Kinds Of Music Easily And Perform Very Well In The Home Playback Environment. Description: 1. Power Supply: and-35V (It Is Recommended To Use Dual 24V AC and Rectifier Filter) It Is Best To Use An Power Supply For Each Channel 2. Power: 80W (and-35V 4) 1 Channel 3. Distortion: Is 0.012 percent Into 1 Kilohertz And Full Power Is 0.015 percent Into 10 Kilohertz And Full Power 4. Circuit Board Size: About 90x85mm 5. Plate Size: About 110 (Including Angle Aluminum) x 90 x 25 (Height) Mm 6. Magnification: 30 Times 7. Measure Quiescent Current: Measure The Voltage At Both Ends Of Point Ab On The Board Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use color:As shown Material:PCB Package Contents: 2 Amplifier Module 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.