Headphone amps, short for headphone amplifiers, are not a single brand but a category of audio devices designed to enhance the performance of headphones by providing higher power output and improved sound quality. These devices are produced by various companies worldwide, including brands like Schiit Audio (USA), FiiO (China), and Sennheiser (Germany). They serve the professional audio and consumer electronics industries, catering to audiophiles, musicians, and audio engineers. Key products include portable and desktop headphone amplifiers, digital-to-analog converters (DACs), and combo units, often used in studios, home audio setups, and on-the-go listening.