The Pro-Ject Pre Box RS Digital preamp 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 our top-class digital products, we use PCM1792 DAC chips from Texas Instruments, but here we use 2 pieces in a dual differential mode 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 select-able impedance for a perfect match to your headphones is also provided.

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 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.

Additional information
Weight 1.95 kg
Dimensions 21 × 20.6 × 7.2 cm



  • Switchable DAC chips: 2x PCM1792 or PCM5102
  • 9 digital inputs: i²S, AES/EBU, Toslink, S/PDIF coax
  • Analog: 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
  • Handmade in Europe


  • DACs: 2x PCM1792 24bits/192kHz; PCM5102 32bits/384kHz
  • Tubes: 2 x 6922EH Frequency response: 20Hz – 50kHz (0dB/-0,1 dB)
  • Signal to noise ratio: -100dB (IEC -A)
  • THD: 0,005% solid state / 0,25% tube
  • 1x USB 2.0 Audio 32/384 + DoP (DSD64/128)
  • 1x RJ45 Sonic I2S for CD Box RS in Sonic mode
  • 2x S/PDIF 24/192 coaxial
  • 4x S/PDIF
  • Optical: 24/96, 1x AES/EBU balanced 24/192
  • Line-level inputs: 1 pair RCA sockets
  • Input impedance: 33kΩ
  • Analog outputs: 1x XLR + 1x RCA pre out, headphone (6,35mm jack)
  • Headphone impedance: 5/20/50 Ω switchable
  • Analog input sensitivity: 1,6V rms for full headphone output
  • Master clock output: 16,9344MHz
  • Outboard power supply: 20V/3A DC, suitable for your country’s mains supply
  • Power consumption: 300mA solid / 850mA tube / 90mA standby
  • Replacement battery remote control: 1 x CR2032 / 3V or 1 x CR2025 / 3V

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