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Pro-Ject Pre Box RS Digital - Pre-Amp / DAC / Headphone Amp


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Colour: Black

  • Black
  • Silver
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The Pro-Ject Pre Box RS Digital combines all features of DAC Box RS plus a very linear pre-amplifier with both solid-state and tube output stages, that can be selected alternatively. As in all Pro-Ject top-class digital products,  PCM1792 DAC chips from Texas Instruments are used, but here 2 pieces in a dual differential mode are used to achieve ultimate fidelity. As a selectable feature, a second DAC chip from Texas Instruments is on board, that can handle 32bit/384kHz. A high-class headphone output with selectable impedance for a perfect match to your headphones is also provided.

The Pre Box Digital RS offers 3-dimensional sound-staging, perfect micro dynamics and ultimate resolution combined with flexibility to use a wide range of digital and 1 analogue sound sources. Perfectly combined with the Pro-Ject CD Box RS disc drive, Pre Box RS Digital will give outstanding sound experience, because of a I²S connection provided via RJ45, that is able to give jitter-free disc playback.


  • Switchable DAC chips: 2x PCM1792 or PCM5102
  • 9 digital inputs: i²S, AES/EBU, Toslink, S/PDIF coax
  • Analogue: Pre-out XLR/RCA/headphone, RCA input
  • Headphone amp with adaptable output impedance
  • Fully balanced double mono design
  • Output stage switchable between 6922 tube & solid state
  • Ultra-linear and ultra low noise
  • Pure Class A circuitry
  • Blue Alps volume control
  • DC power supply (< 1 watt standby power)
  • IR remote control included
  • Available in black and silver

Technical Specifications

  • DAC: DAC1 – 2 x PCM1792 24bits/192k Hz, DAC2 – PCM5102 32bits/384k Hz
  • Tubes: 2 x 6922 EH
  • Digital inputs:
    • 1 x USB 2.0 Audio 32/384 + DoP-DSD 64/128
    • 1 x RJ45 Sonic I2S for CD Box RS in Sonic Mode
    • 2 x S/PDIF 24/192
    • 4 x S/PDIF Optical 24/96
    • 1 x AES/EBU balanced 24/192
  • Line-level input: 1 RCA/phono sockets
  • Input impedance: 33 kohms
  • Analog outputs: Pre-out (XLR & RCA), Headphone (6.35mm jack)
  • Headphone impedance: 5 / 20 / 50 Ohms switchable
  • Analog input sensitivity: 1.6V RMS for full headphone output
  • Frequency response: 20 Hz - 50 kHz (+ 0dB/- 0.1 dB)
  • Signal to noise ratio: -100 dB (IEC-A)
  • THD: 0.005% solid state output/ 0.25% tube output
  • Master clock output: 16.9344 MHz for CD Box RS in Sonic Mode
  • Outboard power supply: 20 V/3 A DC suitable for your country's mains supply
  • Power consumption: 300 mA solid / 850 mA tube / 90 mA standby
  • Dimensions W x H x D: 206 x 72 x 210 mm with sockets
  • Weight: 1950 g without power supply

Further Information

Pro-Ject Pre Box RS Digital - Pre-Amp / DAC / Headphone Amp - User Manual

Pro-Ject Pre Box RS Digital - Pre-Amp / DAC / Headphone Amp - Product Information


Black, Silver

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