Pro-Ject Pre Box RS2 Digital


High end preamp, D / A converter, headphone amplifier

The most universal and future-proof high-end preamplifier, DAC, headphone amplifier!

The Pre Box RS2 Digital is the big brother of our award winning and groundbreaking Pre Box S2 Digital. 

1 995 €

The same excellent-sounding DAC chips as in the S2 version are used, proving once again that the Pre Box S2 Digital was already on top of the list of high-end DACs and absolutely unrivaled. Based on the same principles of core design, the functionality is expanded and taken to new heights. The result is a fantastic sounding and very versatile box. The perfect partner for the crème de la crème of high-end amplifiers and speakers!

The Pre Box RS2 Digital is a DAC and preamplifier that uses a dual-mono configuration of the first-class D / A converters from ESS Saber. ESS9038Q2M chips deliver the highest sound quality in low-cost, high-end circuits. Unlike most DACs in this price range, the Pre Box RS2 Digital includes two DACs and separate signal paths for the left and right channels. Thanks to these converters, the Pro Box RS2 Digital also supports up to 32-bit / 768 kHz PCM and DSD (up to DSD512) files via USB and covers all the digital files you can buy or stream. The analogue output is in solid state and in high quality tube technology. Thus, the customer can choose which of the options is preferred.

The pre-box has eight digital filters. One of them is MQA's proprietary Optimal Transient Digital Filter. With these filters, the listener can adjust the sound to his own preferences.
Pre Box RS2 Digital comes with full HW and SW support for MQA (Master Quality Authenticated) technology. In the pre-box, the USB input signal is processed by a powerful multi-core XMOS microcontroller with advanced multi-core RISC architecture. For re-clocking, Altera's CPLD MAX II (Complex Programmable Logic Device) chip is used, which together with the XMOS microcontroller enables high-quality processing of both classic and MQA technology. For optimal use of this technology, it is best to connect the Pre Box in conjunction with the TIDAL service to our Stream Box S2 Ultra. You can also enjoy MQA quality by connecting it to our new revolutionary CD transport system, the CD Box RS2 T.

The headphone amplifier is the ultimate design. No compromise. No coupling capacitors. Not even at the exit. The entire amplifier is DC coupled. A very fast DC servo ensures that there is no DC voltage at the output. The output power is suitable for all types of headphones.

A premium all-aluminum remote control is included in the box, and the Pre Box RS2 Digital is available in a high quality silver or black aluminum case. On the large display on the front, all relevant information is displayed clearly, clearly and structured. Navigation in the menu is very responsive and allows you to set up the device in seconds according to your wishes!


  • Dual Mono DACs: 2x ESS9038Q2M
  • High-quality, optionally selectable upsampling of PCM and / or MQA content with Propriatory Filtering
  • Advanced re-clocking through new XMOS chip with multi-core RISC architecture
  • 9 digital inputs: i²S HDMI, AES / EBU, Toslink, S / PDIF coax, Bluetooth v4.0
  • Analog: Pre-out XLR / RCA / Headphone, RCA input
  • Fully balanced dual mono design
  • Output switchable between 6922 tube & solid state
  • Ultra-linear and extremely low in noise
  • New high-quality display with intuitive and fast UI design
  • High quality all-aluminum remote control included
  • Available in silver and black

Technical specifications

D / A converter2x ESS9038Q2M (dual mono - 32bit / 768kHz /
digital inputs1 x USB 2.0 Audio 32/768 + DoP and Native DSD up to DSD512
1 x HDMI I2S for CD Box RS2 T
2 x S / PDIF optical 24/192
1 x S / PDIF coaxial 24/192
1x AES / EBU balanced 24/192
MQAfull MQA unfolding in hardware
Line-level entrance1 pair of RCA jacks
1 pair of XLR sockets
input resistance15 kOhm
output resistance180 ohm solid state, 220 ohm tube
Analog outputsPre-out (XLR & RCA)
Headphones (6,35mm)
Headphone Amplifier Performance90 mW / 300 ohms; 245 mW / 32 ohms; 90 mW / 8 ohms
THD + N (20Hz - 20kHz)<0.006% Solid State / 0.017% Tube @ 2V RMS, 1kHz
Master Clock16.9344MHz for CD Box RS2 T
Bluetooth versionFully embedded Bluetooth® v4.0
Bluetooth codecsSBC, AAC, AptX
Output bufferdiscreet and balanced, tube and solid state tubes: 4 x 6922EH
power adapter20V / 3A DC, 110-240V / 50, 60 Hz
inputMax. 1.2A DC, <0.5W in standby
Dimensions W x H x D (with sockets)206 x 72 x 222 mm
mass1710 g without power supply

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