Pro-Ject Pre Box S2 Digital Micro-sized digital stereo preamp with built-in headphone amp (Black)
Pro-Ject Pre Box S2 Digital Front

Pro-Ject Pre Box S2 Digital Micro-sized digital stereo preamp with built-in headphone amp (Black)

Part Number: Pro-Ject-Pre-Box-S2-Digital-Black
Your Price:$659.99
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Micro-sized digital stereo preamp with built-in headphone amp (Black)

Pint-sized audio precision

Use this little gem for high-fidelity sound with your digital audio sources, including high-res audio tracks. The Pro-Ject Pre Box S2 Digital measures barely over four inches wide, but it's big on flexibility. Use its stereo RCA outputs to feed pristine audio signals to a pair of powered desktop speakers or a power amp. Or connect your favorite set of headphones to the front-panel 1/4" jack.

Built to impress

The Pre Box S2 Digital sports a dual mono configuration, with two high-performance DACs (digital-to-analog converters) onboard. It can play just about any high-res audio track you send its way, including super-high-res DSD files. There's built-in hardware support for MQA (Master Quality Authenticated) files, such as those available through TIDAL's streaming audio service. Jitter - digital timing errors that can smear musical details - is reduced to vanishingly low levels. It all adds up to surprisingly robust sound, given the Pre Box S2's small size and reasonable price tag.

Praise for the Pro-Ject Pre Box S2 Digital from The Absolute Sound

"The Pro-Ject Pre Box S2 Digital offers audiophiles a very high-value DAC/digital preamp at an almost ridiculously low price. Not only does it include a plethora of important features, but it sounds good, has an elegantly designed control surface, and is expandable."

- From Steven Stone's January, 2019 review in The Absolute Sound Read the full review

Product highlights:

  • Featured in our article: Best DACs for 2024
  • dual mono circuitry with two high-performance ESS Sabre DACs (ESS9038Q2M)
  • high-res audio playback, including PCM-based files up to 32-bit/768kHz and DSD512
  • full hardware-based MQA support
  • selectable digital filters
  • vanishingly low jitter (as low as 100 Femtoseconds)
  • frequency response: 20-20,000 Hz
  • total harmonic distortion: 0.0003%
  • headphone output power: 68 mW (32 ohms)
  • 1 coaxial digital
  • 1 optical digital (Toslink)
  • 1 USB Type-B for connection to a computer
  • RCA stereo output (rear-panel)
  • 1 front-panel 1/4" full-sized headphone output
Dimensions & Warranty:
  • 4-1/16"W x 1-7/16"H x 5-9/16"D
    •'s in-house depth measurements are made with all relevant cables in place
  • weight: 21 oz. (without power supply)
  • warranty: 2 years
  • MFR # 9120065186400

What's in the box:

Pro-Ject Pre Box S2 Digital owner's manual

  • Micro preamplifier
  • AC adapter with attached 45" DC output cord and Micro-B USB plug (DC output: 5.0V 1.0A)
  • 3 AC plug adapters (US / EU / UK)
  • Wireless remote control (12-button)
  • CR2032 Coin cell battery (for remote)
  • CD with USB driver
  • Instructions for Use (English)
  • Instructions for Use (German)

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