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Pro-Ject Pre Box RS Digital Silver Preamplifier
Pro-Ject Pre Box RS Digital Silver Preamplifier 0
Pro-Ject Pre Box RS Digital Silver Preamplifier 1

Pro-Ject Pre Box RS Digital Silver Preamplifier

Model #: Pre Box RS Digital-SV
At a Glance
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 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.
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Get to know this product.

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. 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.


  • 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

DACDAC1 – 2 x PCM1792 24bits/192k Hz; DAC2 – PCM5102 32bits/384k Hz
Tubes2 x 6922 EH
Digital Inputs1 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 Input1 RCA/phono sockets
Input Impedance33 kohms
Analog OutputsPre-out (XLR & RCA), Headphone (6.35mm jack)
Headphone Impedance5 / 20 / 50 Ohms switchable
Analog Input Sensitivity1.6V RMS for full headphone output
Frequency Response20 Hz - 50 kHz (+ 0dB/- 0.1 dB)
Signal To Noise Ratio-100 dB (IEC-A)
THD0.005% solid state output/ 0.25% tube output
Master Clock Output16.9344 MHz for CD Box RS in Sonic Mode
Outboard Power Supply20 V/3 A DC suitable for your country's mains supply
Power Consumption300 mA solid / 850 mA tube / 90 mA standby
Dimensions W x H x D206 x 72 x 210 mm with sockets
Weight1950 g without power supply

Misc. Specs

Product Weight (lbs.)4.3000
Analog Audio(RCA) Input1
Color Finish NameSilver
WarningProposition 65 Warning for California Residents