Pro-Ject Phono Box S2 is a high-quality phono preamplifier that is designed to be used with moving magnet (MM) and moving coil (MC) cartridges. It features a switchable MM/MC input, a built-in adjustable gain control, and a high-quality output stage. The Phono Box S2 is a great choice for anyone looking to improve the sound quality of their turntable system.