Pro-Ject Pre Box RS Digital  

High-end pre-amplifier, DAC, Headphone amp  


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open page Specifications       PDF Productinfo [pdf, 711 KB]       PDF User Manual [pdf, 317 KB]       

• Switchable DAC chips: 2x PCM1792 or PCM5102  

• 9 digital inputs: iēS, 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  


The most universal & future-proof high-end pre-amplifier, DAC, headphone amp!  


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. 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 IēS connection provided via RJ45, that is able to give jitter-free disc playback.  


Other unique advantages of this true high-end DAC/preamplifier:  

1. Fully balanced double mono design with DAC chip selection  

2. Class-A circuitry with no negative feedback  

3. Tube or solid state output stage can be selected alternatively  

4. Separate power supply as an upgrade option for further improved sound quality.  

5. Headphone output for outstanding experience.  


Pre Box RS Digital is available in silver or black finish.  


SRP: € 1.199,00  


Recommended accessories:  



Control it DS/RS


Sound optimization  

The addition of linear power supply Power Box RS Uni 1-way (SRP € 399,00) or Power Box RS Uni 4-way
(SRP € 599,00) adds even more depth and lets you hear all microscopic fine detail.  

Power Box RS Uni 1-way

Power Box RS Uni 4-way

CAUTION: Please check the power connection of your Pre Box RS Digital on the rear side. In case of an 18V 2.5 connection, a Connect It Power MiniXLR 18V 2.5 adapter cable is necessary to power the unit with a Power Box!  





High Fidelity - Polands audio product of the year 2014  





Headfonia 06/2016  

Stereo - Hifi Exklusiv 05/2015  

HIGH & Style 03/2015  

Hifi Eins Null 08/2014  

Stereoplay 06/2014  



For Apple OSX and Linux you dont need a driver. For Windows up to 24Bit/96kHz you also don't need a driver.  



Computerconfiguration for DSD playback  



FAQ - Hints for using Pre Box RS Digital  


Q: Does the device support Windows 10?  

A: The device is fully compatible with Windows 10. It may be necessary to reinstall latest drivers after updating from Windows 7/8/8.1 to Windows 10.  


Q: Does a driver exist for Mac OSX- or Linux-Systems?  

A: You do not need a driver. The driver is already integrated in the operating system.  


Q: Pre Box RS Digital will not be recognized by Mac OSX and is not available under Audio. What can I do?  

A: Turn off your Computer and press at start alt+cmd+p+r until another starting sound appears. With this command the USB bus will be reset and the USB Box will be recognized new.  


Q: Pre Box RS Digital will not be recognized by Mac OSX (El Capitan) or does not output sound.  

A: There are many forum reports about that issue. It is a widely spread error affecting a wide array of USB DACs, unfortunately there is no current fix for this problem, since it lies in the Core Audio of Apple's OSX. We advice not to use our USB DACs with OSX El Capitan.  


Last update 18.07.2018

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