S-amp provides an elegant solution for headphone monitoring, either on stage or in the studio. The S-amp is a specially designed headphone amplifier that allows you to control the level balance between four sets of headphones. Providing unusually high power levels and superb audio fidelity, the S-amp is compatible with virtually all popular headphone models. And just because this unit is miniature, don't be surprised with its great sound and reliability, thanks to the use of high quality components and solid build construction.