Portable DACs and headphone amplifiers are used to significantly improve sound quality when listening from a phone, laptop or other digital device. Compared to integrated sound cards, they offer higher power, a cleaner signal and better control over headphones, resulting in more detailed and dynamic playback. Most devices in this category combine a D/A converter and a headphone amplifier in a single unit, making them a simple and effective solution without complicated setup. They are useful for both mobile listening and computer work, where they can raise the sound to a noticeably higher level without modifying the host device.