Input expansion for amplifiers and pre-amplifiers. he Switch Box S provides extra line-level inputs expanding the system accommodating capabilities of, for example, the Receiver Box, Stereo Box and Pre Box. Additional Line-level outputs permit connection to a headphone amplifier such as the Head Box II. The shielded metal enclosure cosmetically matches other Box Design components. Additionally, the Switch Box S can be used with non-Pro-Ject components. 4 inputs 2 line outputs for separate usage Suitable for amplifiers (Pro-Ject Audio or other brands) Three-input expansion for Pre Box S Ultra-low crosstalk Automatic synchronisation with trigger cable of Pre Box S Solid cabinet protects against vibration and interference