Pro-Ject Power Box RS Phono power supply

High-end battery-powered power supply unit for Pro-Ject's Phono Box RS preamp

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Manufacturer : PRO-JECT

489,00 €

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Shipped within 3 to 5 working days Available within 1 or 2 weeks

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Pro-Ject, like most leading manufacturers, firmly believes that power supply is paramount to an audio device. Alone it significantly contributes to the sound quality.

Striving for the best sound quality and optimum isolation for the Phono Box RS preamplifier, Pro-Ject has developed this great high-end Power Box RS Phono power supply unit. It really gives a mighty boost to their benchmark preamp.

Pro-Ject Power Box RS Phono power supply

Pro-Ject Power Box RS Phono: features

The Power Box Phono RS uses batteries to fully isolate the preamplifier from the power grid.

The housing accommodates a Lithium Polymer battery for each channel. The power supplied is pure and clean. The weaker the signals, the more sensitive they are! An MC phono preamplifier processes signals with amplitudes of less than one thousandth of a volt! The quality of the power supply unit directly affects the sound quality and its substance.

When Pro-Ject's Power Box Phono power supply unit is fully charged and connected to the Phono Box RS, it is fully isolated from current and voltage interferences and line noises.

When the battery voltage decreases and reaches the charge limit, the charger is connected automatically. The charge status is shown via a LED on the front panel.

Pro-Ject Power Box RS Phono power supply

Playback has no time restrictions, though the benefit of fully isolating the preamp from the mains is lost. The battery acts as a buffer and hence a filter, and the sound quality is far superior to a standard power adapter.

When charged, it runs for approx. 4 hours and the total charge time is about 4 hours.

Pro-Ject Power Box RS Phono: listening and review

The Power Box RS power supply completely transcends the sound quality of the Phono Box RS!

The dynamics span more evenly across the entire spectrum. It's as if a cloud had been lifted! Everything appears clearer and more coherent.

The level of detail is quite amazing. It cranks articulation and nuance up a notch! The music becomes more obvious!

A true upgrade for the Phono Box RS, which makes it one of the best phono preamplifiers in the range... Highly recommended!


Output voltage: +/- 14.8 V to +/- 16.8 V (depends on the battery charge level)

Battery: 15 volts Li-ion 2000 mAh, x 2

Charging time: About 4 hours on standby

Time of use: About 4 hours

Outboard power supply: 20 V/3000 mA DC

Dimensions: 201 x 72 x 195mm

Weight: 2.030 kg without power supply

Banc d'essai - AnalogPlanet

0.45 Mo - pdf

Customer reviews
(2 reviews)

Customer reviews


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Bonjour, je rejoins le premier avis donné, c’est tout bonnement un plus indéniable avec des gains vraiment audibles. Investissement indispensable.



Changer l'alimentation du préamplificateur Phono Box RS avec le Power Box RS a été pour moi un choc, dans le bon sens du terme. Tout y a gagné, l'image Stéréo plus large et profonde, les ambiances mieux retranscrites, la lisibilité grandement améliorée ainsi que la dynamique, c'est un peu comme si j'avais changé ma cellule, pour un modèle plus haut de gamme. Il faut bien reconnaitre que les petits courants produit par les cellules MC sont vites perturbés par l'environnement électrique et radio. L'alimentation de ce préamplificateur mérite mieux que le petit transfo de base. L'alimentation est plus puissante grâce aux deux jeux de batteries en série, un par canal. L'autonomie est largement suffisante. L'investissement vaut largement le gain produit par cette alimentation sur la restitution finale du préamplificateur.
Un grand merci à toute l'équipe Ma, et surtout à Franck et Olivier pour leurs précieux conseils.

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Pro-Ject Power Box RS Phono power supply

Pro-Ject Power Box RS Phono power supply

High-end battery-powered power supply unit for Pro-Ject's Phono Box RS preamp

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