Headphone amplifier

/hˈɛdfəʊn ˈamplɪfˌaɪə/

/hˈɛdfoʊn ˈæmplɪfˌaɪɚ/

Headphone amplifier

a device that amplifies audio for headphones, providing increased volume and improved audio quality

Examples

1. And this is their 5.1 channel headphone amplifier.

2. Speaking of commuting, the Massdrop Objective 2 Headphone Amplifier, aka the O2 amp, is really not very portable at all.