Power Box RS Phono is a power supply upgrade made specifically for owners of Pro-Ject Phono Box RS (18V). Significantly improving performance via isolation of the phono preamplifier from mains interference, we’ve taken a battery-powered approach. Pure and clean energy is highly important where low-level signals are amplified. This is epitomized in the phono signal which requires special handling and more gain than other sources. The dual-mono circuitry of Phono Box RS is already well-isolated and shielded by the the aluminum/steel enclosure – Power Box RS Phono enhances this isolation in a manner you’ll hear upon first listen.

Additional information
Weight 2.03 kg
Dimensions 19.5 × 20.1 × 7.2 cm



  • Purest & cleanest power for Phono Box RS phono stage
  • Fully isolates Phono Box RS from mains interference during playback
  • Advanced Lithium Polymer battery (one for each channel)
  • Playback time of approximately 4 hours
  • Charging time of approximately 4 hours
  • Optimized battery life due to intelligent micro-processor-controlled charging electronics
  • Status indicator LEDs on front
  • Handmade in Europe


  • Output voltage: from ±14.8V to ±16.8V (depending on battery charge level)
  • Battery type and capacity: Li-ion, 2000mAh
  • Charging time: approx. 4 hours (longer when Phono Box RS in use)
  • Battery playing time: approx. 4 hours
  • Power supply: 20V/3A