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%, 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: +-35V (It Is Recommended To Use Dual 24V AC + Rectifier Filter) It Is Best To Use An Power Supply For Each Channel 2. Power: 80W (+-35V 4Ω) 1 Channel 3. Distortion: Is 0.012% Into 1 Kilohertz And Full Power; Is 0.015% 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.