Power Box S3 Phono is a very efficient and flexible power filter for your turntable and phono preamp. By separating the power supply from the main component, noise and signal contamination are avoided. It is no secret that clean, steady power contributes significantly to the sound quality of audio components.

An Instant Upgrade for Turntables & Phono Preamps

The two outputs are specifically engineered to power Pro-Ject turntables (15V DC only!) and phono preamps (18V). Sophisticated DC filtration allows your turntable & preamp to perform their best. Expect greater speed stability from your turntable and a lower noise floor from your phono preamp, amounting heightened clarity and resolution in analog playback. In addition to the sonic improvements, Power Box S3 Phono also helps with cable/PSU management by eliminating the need for turntable & phono preamp wall-wart power supplies.

Additional information
Weight 0.37 kg
Dimensions 10.6 × 10.3 × 3.7 cm



  • PSU upgrade for Pro-Ject phono gear
  • Compatible with all 18V Phono Boxes
  • Compatible with 15V DC turntables*
  • Ultra stable & clean power
  • Low-noise power output
  • Linear voltage regulation
  • Low ESR capacitors
  • Metal enclosure helps block RFI/EMI
  • Available in black or silver
  • Made in Europe

*Not suitable for X8, Xtension 9, Xtension 10, Xtension 12, RPM 5, RPM 9, RPM 10 nor Signature
models. For these turntables we recommend Power Box RS2 Phono or Power Box RS Uni TT.


  • Input power supply: 18V / 1000mA
  • Output voltage/ripple: 1 x 15V ±0.5%
  • Output voltage/ripple: 1 x 18V ±0.5%
  • Output current: combined max. 1000mA
  • Dimensions (WxHxD): 103 x 37 x 106mm
  • Dimensions (standard): 4.06 x 1.46 x 4.17″
  • Weight: 370g (0.82 lbs) without power supply