TD series features: The professional power amplifier series adopts stable AB and H circuit designs, with a focus on stability under long-term continuous full power use conditions. The circuit board is designed through a computer simulation system for circuit layout, and the main components are processed using separate element processing; All separation components are made of ON tubes imported from the United States, and the PA series amplifiers adopt optimized heat sink structures and high-quality heat dissipation fans, ensuring reliable long-term high-power operation; The fan accelerates automatically with random temperature changes. When the impedance of the connected load is too low or the temperature is too high, the machine will adjust the power supply to reduce the internal resistance of the power supply, improve sound quality, and effectively protect the machine, greatly improving reliability; The PA series amplifier has a high conversion rate, beautiful sound quality, and low distortion. The entire series adopts a 2U chassis structure design. The PA series has three working modes: stereo parallel and bridge modes, with input sensitivity selection and ground channel disconnect switch.