Pro-Ject Pre Box S2 Digital DAC, Headphone Amp & Preamp - New Old Stock

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General:
The Pro-Ject Pre Box S2 Digital is one of our favorite DACs at this price point, and for good reason. Not only is it an excellent standalone DAC, but it also doubles as a preamplifier and headphone amplifier, making it an incredibly versatile little unit. Especially for a desktop audio setup.

Designed by renowned audio engineer John Westlake who was also behind several acclaimed products from Quad and Cambridge Audio, the Pre Box S2 Digital packs some serious technology into a remarkably compact package.

Some of our favorite features include its crisp OLED display, solid all-metal construction, dual-mono design featuring two ESS Sabre ES9038Q2M DAC chips, and convenient remote control (included).

 It also offers several selectable digital filter settings, allowing you to fine-tune the sound to your liking. And for those looking to get the most from their digital music collection, the USB input supports both DSD and MQA playback.

There's very little at this price point that offers this combination of sound quality, features, and build quality. And it's made in Europe!

Best of all, this particular Pre Box S2 Digital is brand new, New Old Stock (NOS), and has never been used. It shows absolutely no signs of wear and includes everything originally supplied from the factory. A fantastic opportunity to pick up one of our favorite compact DACs in brand-new condition.

Please note: This is the original Pre Box S2 Digital, the predecessor to the current Pre Box S2 Digital Edition 23, which retails for $500.

From Pro-Ject:
This little desktop DAC is capable of high resolution audio up to 32bit 768kHz PCM and DSD512! Pre Box S2 Digital is also supports hardware MQA unfolding.

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.

SkyFi Cosmetic Notes:
New, never used.

Ownership:
Brand New

Connections:
RCA output, Digital Toslink, USB input,

General Sound:
Accurate to the recording

Cosmetic Condition:
New = Factory sealed and unopened. See our detailed rating description here.

Working Condition:
Working perfectly and tested on our bench with both CD and DVD. XLR and RCA working as they should.

Included:
Everything like when it arrived new

Packing:
Will be packed using our highly developed in-house process and custom packing materials.Original MSRP:
$399.00

Specs:
Digital Inputs:
- 1x Coaxial (S/PDIF)
- 1x Optical (TOSlink®)
- USB

D/A Converter:
- 2x ESS9038Q2M 32-bit PCM 768kHz / DSD512

Headphone Amplifier Chip:
- ESS9602

Supported Sampling Rates:
- 32 / 44.1 / 48 / 88.2 / 96 / 176.2 / 192 / 352.8 / 384 / 768 kHz

DSD Support:
- DSD64
- DSD128
- DSD256
- DSD512

MQA Support:
- Full hardware MQA unfolding

Filter Settings:
- 8 selectable filters (front panel selectable)

Frequency Response:
- 20 Hz – 20 kHz

Analog Outputs:
- 6.3mm Headphone Output (front)
- 1x Variable RCA Output

Output Voltage:
- 2.05 Veff

Headphone Output Power:
- 68mW @ 32 Ohms

THD:
- 0.0003%

Dynamic Range:
- 124dBA

Power Consumption:
- 5V via Micro USB

Dimensions:
4.1" × 1.5" × 4.8" (03 mm × 37 mm × 122 mm)

Weight:
0.8 lbs.

Approximate Age:
2025

Recommended Cables:
Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - Coaxial Digital Interconnect

Kimber Kable - Optical Digital Interconnect

Kimber Kable - Select Series Reference USB Cable

Testing Process:
We start with a test signal to verify signal lock and proper output on both channels. If the DAC has balanced outputs these are also tested at this time. If the DAC has multiple Optical and Coaxial inputs they are all checked for proper lock. USB inputs are tested with a MacBook Pro. 

After proper function is verified, we setup the DAC for a listening test to evaluate general audio reproduction quality and monitor for clicks, pops, or any other audible signs of issues related to dropped signal lock or failing audio output stages. We often connect the DAC under evaluation to our long term test rig for a long test stint to verify stability under real world operating conditions.