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Pro-Ject Power Box RS Phono Battery-Powered Power Supply Upgrade for Phono Box RS

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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.


  • Purest & cleanest power for Phono Box RS
  • Fully isolates Phono Box RS from mains interference and noise while playback
  • Advanced Lithium Polymer battery (one for each channel)
  • Playback time approximately 4 hours
  • Charging time approximately 4 hours
  • Optimised battery life due to intelligent micro-processor controlled charging electronics
  • Status indicator LEDs on front
  • Available in silver or black
  • Handmade in Europe
  • Specs
  • Output voltage: from +/-14,8V to +/-16,8V, depends 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
  • Weight: 2.03 kg
  • Dimensions: 19.5 × 20.1 × 7.2 cm
  • Color: Black, Silver
Power Supplies

Product Reviews

  • 4
    Battery power supply.

    Posted by Steve on Jun 11th 2023

    I often wonder, when someone makes a claim of an amazing change with a new piece of equipment, what was wrong with their system to start with. The only thing I noticed with the addition of this item was slightly less noise in the silent parts. I run fully balanced from phono cartridge to amplifier. Equipment is all Krell pushing pair of Maggies with bass panels. All cables are Cardas. I believe that anyone purchasing this item expecting it to "fix" something will be disappointed.

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