Class A refers to a category of vehicles that are designed for specific purposes, often characterized by their size and weight. In many regions, Class A vehicles include large trucks and buses that exceed certain weight limits, typically over 26,000 pounds. These vehicles require special licensing, such as a Commercial Driver's License (CDL), to operate due to their complexity and the skills needed to drive them safely. In the context of audio equipment, Class A amplifiers are known for their high-quality sound reproduction. They operate by using a constant current, which allows for minimal distortion and a more accurate audio signal. However, they are less energy-efficient compared to other amplifier classes, such as Class B or Class D, and tend to generate more heat during operation.