The 2 Channel Class D Professional Stereo Amplifier uses power crystals and heat sinks to directly press together, remove the traditional insulation pad, and achieve zero thermal resistance conduction through the metal contact surface, so that the heat of the transistor is quickly transferred to the heat sink. For example, the contact surface between the heat sink and the transistor uses high thermal conductivity silicone grease or phase change material to reduce the interface thermal resistance. Each power crystal is evenly distributed at the cold air inlet with the shortest distance to ensure that the heat is quickly taken away and the temperature difference between the crystals is less than 5°C to avoid local overheating.

Equipped with 4 dual DC stepless variable speed fans, the radiator temperature is monitored in real time through thermistors, and it automatically starts when the temperature reaches 45°C, and the speed is dynamically adjusted according to the load. For example, when running at full power, the fan speed is increased to 3000RPM, and the noise is controlled below 45dB. The diagonal flow fan and the volute air duct are used to reduce airflow turbulence noise; the fan start-stop logic is optimized through algorithms to avoid mechanical noise caused by frequent start-stop.

The radiator is electrically suspended, and the power crystal is directly pressed onto the radiator. The fin structure of the radiator is used to increase the air convection area, and the heat dissipation efficiency is increased by 30% under the same volume. The chassis uses a vertical air duct, and the cold air is sucked in from the bottom and discharged from the top after passing through the radiator, forming an independent heat dissipation channel to prevent heat accumulation in the chassis.

When the radiator temperature exceeds 85°C, the first-level protection is activated to reduce the output power by 10%; when the temperature reaches 95°C, the second-level protection is activated to reduce the output power by 30%; when the temperature exceeds 105°C, the output is cut off and the sound and light alarm is triggered. Add spare fans or heat dissipation fins on the key heat dissipation path to ensure that 80% heat dissipation efficiency can be maintained when a single fan fails.