preamplificatore phono phono box ds3 bPhono Box DS3 B, where B stands for balanced. Pro Ject Phono Box DS3 B uses a completely discrete design, therefore without the adoption of any operations on the signal path, and optimized by performing many hours of listening and tuning. The circuit topology foresees, after a first input stage, a completely passive RIAA equalization, with consequent further improvement of the signal noise ratio, which is the main problem of all Phono preamplifiers.