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Project Power Box RS Uni Power Supplies

The Uni power supplies are high quality Linear supplies designed to be used with certain Pro-ject items so that the standard Switch Mode Power Supply can be replaced.

Before discussing them, here’s a bit of background (skip down a couple of paragraphs if you’re already sold on Linear supplies!).

Switch Mode power supplies are primarily used by manufacturers because they are small, lightweight, very efficient (particularly when no power is being drawn) and cheap. They work by increasing (switching) the 50Hz mains supply to a much higher frequency, theoretically well above the audio band. The downside with most Switch Mode Power Supplies is noise, not only do the supplies have high frequency hash imposed upon the DC output they can also radiate physically and even back onto the mains supply, ready to impact other items plugged into the mains nearby.

When comparing Switch Mode supplies against Linear ones it’s always wise to do two comparisons, firstly the Linear supply (with the switch mode unplugged from the mains) against the Switch Mode. Secondly listen just to the Linear with the switch mode plug into the mains (but not connected to the item) and then removed. What you will normally hear are the biggest improvements on the first test, but even on the latter there’s often a lifting of grain and hash from the sound.


Above: Black Finish Pro-Ject Uni.

There are two versions of the Uni, the only difference is the number of outputs. The Uni 1 is designed to run a single item, the Uni 4 can run up to four. Both are housed in the same deceptively near half width case that all the other Pro-Ject RS components are in, and available in the same Silver or Black finishes.

I wont go on at great length again here about the sonic improvements as I have done so on some of the pages featuring the products that run off these boxes. However I can confirm that they do offer a significant upgrade over the standard power supplies. Undoubtedly a large amount of this is due to the reduction in high frequency noise, but they are also a lower impedance and higher current supplies, which explains the gains in dynamics, bass control and depth.

Above: rear of Pro-Ject Uni 4, which shows the four outputs.

Some items can be plugged straight into the Uni Box, these include  the CD Box RS, DAC Box RS, Head Box RS, Pre Box RS, Pre Box RS Digital and Stream Box RS.

It is also possible to use the power supplies with certain Pro-Ject turntables. These shielded leads have an additional regulator inside a small box allowing them to lower the voltage making it suitable for these decks. Due to the different power requirements of certain models there are two versions available, one high power and one standard. Both versions of the cable are 1.23m long.

Standard TT-Lead Version works with the following turntables:

    RPM 5 Carbon

    The Classic

    2 Xperience SB

    2Xperience Acrylic

    6 Perspex SB

    RPM 9 Carbon

    RPM 10 Carbon

    Xtension 9 Super Pack

High Powered TT-Lead Version works with the following turntables:

    Xtension 10 (DC models, sold after December 2012 only)

    Xtension 12 (DC models only)

    Signature 10

    Signature 12

Project Power Box RS Uni 1way, power supply upgrade: £349.00

Project Power Box RS Uni 4way, power supply upgrade (4 output version designed to power multiple compatible items) : £549.00

Project Power Box RS TT turntable Lead Standard power: £45.00

Project Power Box RS TT turntable Lead High power: £45.00


Above: Pro-Ject RS TT turntable lead

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