Audio line drivers are not a specific brand but a category of electronic devices used in audio signal transmission. They are produced by various manufacturers globally, such as Texas Instruments (USA), Analog Devices (USA), and THAT Corporation (USA). These devices serve industries like professional audio, broadcasting, and telecommunications by amplifying and conditioning audio signals to maintain quality over long distances. Key products include balanced line drivers, differential line drivers, and impedance-matching drivers, often integrated into audio equipment, mixers, and PA systems.