Pro-Ject Pre Box S2 Digital Edition 2023

Updated circuitry and a better power supply.

written by / 2023-07-09 - 8:00 am
Pro-Ject Pre Box S2 Digital Edition 2023

This compact headphone amplifier with three digital inputs was first introduced as far back as 2017. The basic design was created by John Westlake, who built a premium headphone amplifier around a D/A converter.

This way, you could utilise both digital audio sources and have an analogue output, so the Pre Box S2 could also be used as a preamplifier.

(Photo: Pro-Ject)

The internal of the compact Pro-Ject box has been revamped, including a new and more efficient power supply. The analogue output stage has been upgraded with higher Class A power, while the headphone output has been made more powerful. The circuitry around the ESS Sabre ESS9038 converter has been changed, including a redesigned master clock with a completely discrete circuit.

(Photo: Pro-Ject)

The analogue circuits are equipped with new polymer capacitors and MELF film transistors on a four-layer PCB with gold-plated tracks.

The DAC supports MQA via the USB input and Pro-Ject says it has managed to get the jitter noise down below 100 femtoseconds. That’s impressive for such a small box at 449 euros.

The Pre Box S2 Digital Edition 2023 can also be equipped with Pro-Ject’s Accu Box S2 power supply.


Pre Box S2 digital E23-5 Pre Box S2 digital E23-3
(Photo: Pro-Ject)

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