Pro-Ject Speaker Box 5 S2 Bookshelf Speakers. PairReference bookshelf speakers made in Europe! Speaker Box 5 S2 are a bookshelf speaker that prioritise detail as well as totally neutral, faithful reproduction of sound. The wooden chassis comes in two high quality finishes: walnut, and satin black. With Speaker Box 5 S2 we created a monitor speaker which will satisfy music lovers as well as professional musicians. A 25mm silk dome tweeter delivers crystal clear highs, the 150mm fiberglass cone gives