LAB POINTS - audiophile sound for your headphones - quality components deliver deep bass and clear highs - metal case shields the electronics from vibrational and electromagnetic interference - gold plated RCA connection sockets - outboard power supply included LAB REVIEW Pro-Ject"s Headphone Box II delivers the power you need to truly get the most out of high end headphones. Constructed with top quality components, the Headphone Box II delivers deep bass and crisp, clear highs that regular stereos or PC sound cards cannot even come close to replicating. In addition, the unit is housed in a metal casing that shields the electronics from vibrational and electromagnetic interference and includes an outboard power supply to ensure rich, detailed three-dimensional sound.