A headphone amplifier is an audio amplifier that is specifically designed to power headphones and improve the audio quality and volume of the signal being sent to the headphones. Most audio devices, such as smartphones, laptops, and MP3 players, have built-in headphone amplifiers, but they may not provide enough power to drive high-end headphones or deliver the best sound quality. A dedicated headphone amplifier is designed to provide higher power output and better audio performance, with less distortion and noise. Headphone amplifiers can be either portable or stationary, and can use various types of amplification technology, such as solid-state, tube, or hybrid amplifiers. Some headphone amplifiers also offer additional features such as tone controls, EQ settings, and balanced outputs.