Pro-Ject Speaker Box 5 Bookshelf Speakers. PairA True Classic Reborn The Speaker Box 5 has been a staple in our speaker line up and has been in production for over 15 years. The Speaker Box 5 E is the successor and our new version to this all time classic. A superlative sounding small bookshelf speaker. Well tuned and upbeat basslines Lively dynamics Surprisingly low coloration Good transparency and reasonable image depth Bass is fast and tuneful, this is what really matters!