Portable headphone amplifiers are small devices designed to enhance the audio quality of headphones. They boost the audio signal from devices like smartphones, laptops, or music players, allowing for a richer and more detailed sound experience. These amplifiers are especially useful for high-impedance headphones that require more power to perform optimally. Many portable headphone amplifiers are battery-operated, making them convenient for on-the-go use. They often feature various input and output options, allowing compatibility with a wide range of audio sources. Some models even include built-in digital-to-analog converters (DACs) for improved sound processing, further elevating the listening experience.