Stereo preamplifier with DAC
More than five years after the successful commercialization of the Pre Box S2, engineers at Pro-Ject Audio Design and John Westlake, creator of the original design, saw the opportunity to implement key improvements and refinements to it, the result being the new Pre Box S2 Digital Edition 2023.
There are several improvements introduced, affecting subsystems as relevant as the power supply, the audio synchronization clocks, the analog output stage and the headphone amplifier. In the first case, changes have been introduced in order to increase the noise isolation of the USB power sockets of PCs and achieve a wider and flatter output impedance across the entire audio bandwidth. .
As for the master timing clocks, they have been redesigned to reduce phase noise and further refine the already spectacular jitter record. For its part, the new analog output stage, based on the SABRE9603Q “chip” from the renowned American firm ESS Technology, works with a higher Class A current in order to improve performance with low-impedance headphones and lead lengths. longer cables.
Additionally, the headphone amplifier is now more energy efficient, with a 12% reduction in current from the power supply.
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