Pro-Ject Pre Box RS2 Digital is the model up from award-winning Pre Box S2 Digital using the same excellent DAC chips, proving the S2 was already the pinnacle of high-end DACs. With extended feature set, the result is a fantastic sounding versatile box. The perfect partner for superior high-end amplifiers and speakers alike.

Dual Mono Top Class DAC
Pre Box RS2 Digital is a DAC and preamplifier employing a dual-mono configuration of the highest-class DACs from ESS Sabre. ESS9038Q2M chips provide the highest sound quality in affordable, high-end circuits.

Unlike most of DAC´s in this price range, the Pre Box RS2 Digital includes dual DACs and separate signal paths for the left and right channels. Also thanks to these converters, the Pre Box RS2 Digital supports up to 32-bit / 768 kHz files in PCM and DSD formats (DSD512) via USB, covering any digital file you can buy or stream.

Digital Filters
The analog output is a buffer that is both solid state and high-quality tube so you can choose which of the options is preferred. The Pre Box has eight digital filters. One is the proprietary optimal transient digital filter from the MQA creators. With these filters, the listener can customise the sound to suit their own preferences. Pre Box RS2 Digital comes with full HW and SW support for MQA technology.

Multi-Core RISC Architecture
In the Pre Box, the USB input signal is processed by a powerful multi-core XMOS microcontroller with advanced Multi-Core RISC architecture. The CPLD MAX II Altera is used for re-clocking, which together with the XMOS microcontroller brings high-quality processing of both classical and MQA technology.

Recommended System Setup
For the ideal use of this technology, it is best to connect the Pre Box to Stream Box S2 Ultra in conjunction with the TIDAL service. You can also enjoy MQA quality by linking it with new revolutionary CD transport, the CD Box RS2 T. The CD Box RS2 T can be connected to the Pre Box by reliable I²S differential bus via the HDMI connector where the Pre Box RS2 Digital also provides the master clock (16.9344 MHz).

Headphone Amplifier
The headphone amplifier is the ultimate uncompromising DC coupled design. A very fast DC servo assures no DC voltage on the output and the output power is suitable for all kind of headphones. A premium full aluminium remote control is included and it comes in a high-quality silver or black aluminium case. The big display screen shows all relevant information in an easy to read, clean and structured way.

Highlights of Pre Box RS2
- Dual Mono DACs: 2x ESS9038Q2M
- Optionally selectable upsampling of PCM/ MQA
- Advanced re-clocking powered by new XMOS chip
- Multi-Core RISC architecture
- i²S HDMI, AES/EBU, Tos, S/PDIF, Bluetooth v4.0
- Pre-out XLR/RCA/headphone, RCA input
- Fully balanced double mono design
- Output stage between 6922 tube & solid state
- Ultra-linear and ultra low noise
- New quality display with responsive and fast UI design
- High quality full Aluminium remote control included

Specifications

Performance
- DAC: 2x ESS9038Q2M (dual mono - 32/768kHz)
- MQA Support: full unfolding by hardware
- Input impedance: 15 kOhm
- Output impedance: 180/220 Ohm solid state/tube
- Analog out: Pre (XLR/RCA), Headphone (6.35mm)
- Headphone out: 90/245/90mW, 300/32/8O
- THD+N: <0.006/0.017% solid/tube @2V RMS
- Masterclock out: 16,9344MHz for CD Box RS2 T
- Bluetooth: Fully embedded v4.0
- Bluetooth Codecs: SBC, AAC, AptX
- Buffer: discrete, balanced, tube, solid state
- Tubes: 4 x 6922EH

Inputs
- USB 2: 32/768 +DoP, Native-DSD (DSD512)
- HDMI I2S, S/PDIF coax/opt, AES/EBU bal
- Resolution: 24bit / 192kHz
- Line-level: 1 pair XLR, 1 pair RCA

General
- Power supply: 20V/3A DC, 110-240V, 50/60Hz
- Consumption: max/standby 1.2A DC/<0.5W
- Dimensions (WHD): 206 x 72 x 222mm
- Weight: 1710g