1. Overall Structure: NE5534 Pre-Amplifier + 0P07 DC Servo + C1237 Speaker Protection + TDA7293 Post-Amplifier, Reasonable Structure, Excellent Sound Quality, Stable And Reliable Operation. 2. DC Servo/High Power/Stereo 3. The Maximum Power Depends On The Power Supply Voltage And Speaker Impedance, THD=10%, RL=8ohm VS=40V; 4. If It Is A 4ohm Load, The Transformer Voltage Should Not Exceed Dual AC 20V To Avoid Unnecessary Losses; 5. Please Pay Attention To Monitoring The Heat Sink Temperature During Use. If Necessary, It Is Recommended To Use A Fan To Assist Heat Dissipation Power Supply Voltage:AC12-28V*2 (Dual AC) Power Supply:Above 200W Recommended Output Power:100W * 2 Max Output Impedance:4-16ohm Audio Channel:2 Channels, Stereo Circuit Architecture:TDA7293+0P07+NE5534 Advantages:PRE-Stage Regulated DC Servo Delay Protection Protection Characteristics:Overheating, DC, Short Circuit Protection Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB Package Contents: 1 * Power Amplifier Board 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.