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Project Audio Digital Micro Preamplifier Pre Box S2 Digital - PJ65186400



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a performance revolution in a small package!

Pre Box S2 Digital marks a new era for our S-series components. For the very first time we are using a dual mono configuration with the highest class D/A converters of ESS Sabre. Their flagship DAC-chip ensures highest class audio in a small and affordable package. This DAC is capable of high resolution audio up to 32bit/768kHz PCM and DSD512! Pre Box S2 Digital is also the very first of our devices to support hardware MQA unfolding. It’s also the premiere of our proprietary Optimum transient digital filter and our proprietary clock circuitry design. Digital audio is the art of time, with our new proprietary clock design we have managed jitter rates of unrivalled 100 Femtoseconds, this easily outperforms many renowned and respected audiophile clock generators!

With organic polymer capacitors and thin film miniMELF resistors we were able to create a tiny device that will blow away even much bigger components for a much higher price. With a total of eight digital filters the sound can be shaped precisely to the listeners liking. Pre Box S2 Digital is fully remoteable, it can also control the playback software of a computer. You can use Play, Pause, Forward and Rewind straight with your Pre Box S2 Digital!


  • Dual mono construction
  • High end ESS Sabre ESS9038 dual DAC
  • Proprietary clock circuity design
  • Organic polymer capacitors and thin film miniMELF resistors
  • MQA hardware decoding
  • DSD64, DSD128, DSD256 & DSD512 (DoP, DSD512 native)
  • Up to 24bit/192kHz for optical & coax inputs
  • 8 selectable digital filter characteristics
  • 1 proprietary optimum transient digital filter
  • Headphone output on the front (6.3mm)
  • Synchronization of all internal oscillators
  • Jitter as low as 100 Femtoseconds!
  • Gold plated four layer PCB
  • Full alu/metal sandwich casing in silver or black
Digital inputs1x USB (B), 1x Co-axial (RCA), 1x Optical (TOSLink)
Weight366 g (without power supply)
Dimensions W x H x D103 x 37 x 122 mm (including knob and connectors)
Outboard Power supply5V/1A DC (included)
Dynamic range124 dBA
THD0.0003% @ 0 dB, 2V RMS, 1 kHz
Headphone output power6.6 mW / 600 Ohm; 68 mW / 32 Ohm
Minimal recommended headphone impedance8 Ohm
Output voltage2.05 Veff
Analogue outputs6.3mm Headphone (front), 1x Variable Out (RCA
Frequency response20 Hz - 20 kHz
Filter settings7 different selectable on front
CoaxialPCM up to 24b/192kHz
OpticalPCM up to 24b/192kHz
USBup to DSD512 (DSD1024), PCM up to 32b/768kHz
D/A-converter2x ESS9038Q2M 32-bit

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