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Phono Box RS

The Phono Box RS represents Pro-Ject Audio’s first foray into the world of high-end electronics. As masters of the analogue domain, it seems only fitting that their first model in this new Reference Series range is a phono stage of true distinction.


The Phono Box RS is an ultra-low noise and distortion preamplifier made with the audio connoisseur in mind. With this in mind, it offers not only a breathtaking performance, but is also capable of being fine-tweaked to suit a wide variety of premium pick-up cartridges. In fact, the Phono Box RS has a unique variable impedance control on the front panel which means impedance adjustments can now be done during music playback!


Due to the use of some of the finest quality components available, like the SSM2019 pre-amplifier from Analog Devices on the input stages and Linear Technology’s LT1010 as a high current buffer stage, the Phono Box RS delivers ultra-low levels of distortion and noise. Its very low output impedance makes it insensitive to the selection of interconnect cable types and lengths.


Fully-passive RIAA and DECCA equalisation is selectable via the stylish switches on the front panel, as is the output Gain (on XLR and RCA) and a handy Mute function (the F/V switch relates to switching on and off the variable impedance control). Further cartridge adjustment is done via the familiar dip-switch layout on the back panel. The Phono Box RS offers fully balanced, dual-mono circuitry and both XLR and RCA inputs and outputs, earning it recognition in a wide variety of high-end systems.


Key Features Phono Box RS

  • MM and MC capable
  • Fully balanced dual-mono design
  • Fully passive RIAA equalization & DECCA settings
  • Unique continuously variable input impedance loading, matches every cartridge (adjustment can even be made while playing music)
  • RCA / XLR In & Out
  • Superior low noise and low distortion
  • Elegant dip switch controls on the front panel
  • Metal casing protects against vibration and interference

Available in silver or black


Technical Data Phono Box RS


Input Impedance:


Fixed…                       10Ω or 47kΩ

Variable…      10 – 1200Ω


Switchable Load Capacity: 100uF, 120μF, 200μF


Output Impedance: 50Ω


Gain (MM / MC):


RCA…             40, 43, 60 dB

XLR…             45, 56, 66 dB


Signal-to-Noise Ratio:


MM 89dB (97dB – A Weighted)

MC 83dB (91dB – A Weighted)




MM 0.01%

MC 0.05%


RIAA Accuracy: Within 0.3 20Hz – 20kHz


Subsonic: 18Hz / 24dB Per Octave


Inputs: RCA & XLR


Outputs: RCA & XLR


Power Supply: +/- 18V/300mA DC, 220 – 240V, 50Hz




200 x 72 x 194mm

200 x 72 x 200mm (Incl. Sockets)


Weight: 2kg (Without PSU)


Buy today

Buy the Project Phono Box RS today…

We generally carry this item in stock and you can buy it today via our online shop at the following link:

Buy the Project Phono Box RS at www.audiovenue-shop.co.uk