555 PS DR Power Supply

555 PS DR

The ultimate upgrade.
555 PS DR Power Supply

Not everyone sees hi-fi as we do. For us, a smooth, stable, low-noise power supply isn’t just desirable: it’s fundamental to proper hi-fi performance. Nowhere is that belief more clearly exemplified than in our reference 555 PS DR, the best power supply in our portfolio.

Originally designed to partner our world-class CD555 CD player, the 555 PS can also be used with our NDS and NDX network players, our HDX hard disk player/ server and our DAC digital to analogue converter as well as the CDX2 CD player. Whatever Naim Audio product it partners, the 555 PS DR will improve every aspect of your favourite music. Voices and instruments become clearer and more natural. Perceived dynamic range increases too, while timing – music’s fundamental sense of rhythm and accuracy – snaps into even greater focus.


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  • Seven regulated supply voltages, including a separate supply for the CD555 clock circuit
  • Low-resonance case with isolating feet
  • Massive transformer, 40 percent larger than that fitted to the XPS
  • Supplied with Power-Line mains cable as standard
  • All-new Discrete Regulator (DR) configuration, delivering Naim Audio’s best-ever standards of stable, low-noise power
555 PS Power Supply
555 PS DR Power Supply - Rear View
Technology & Craft

The 555 PS benefits from both our decades of experience and our relentless pursuit of superior sound quality. Its massive transformer, some 40 percent larger than that fitted to our XPS power supply, features five separate windings outputting to seven regulated supply voltages, including an output specifically intended for use with the clock circuitry of our CD555.

The 555 PS was updated in 2012 as a result of a two year project to develop a new discrete regulator (DR) for Naim Audio power supplies. The new Naim Audio DR now features, alongside improvements to the wire routing, mechanical decoupling and internal layout. These enhancements, developed through intensive listening tests, significantly raise performance and make music even more communicative and enjoyable.

A technical white paper on the Naim Audio Discrete Regulator technology is available here.

Product Specification

Attribute Value
Power Outputs

± 22V, ± 10V, 12V, 2 x 15V

Attribute Value
Mains Supply

100V, 115V, 230V; 50 or 60Hz

Attribute Value
Shipping Dimensions

240 x 590 x 500 mm


15.7 kg

Dimensions (HxWxD)

87 x 432 x 314 mm

Attribute Value

Brushed and black anodised


Brushed and black anodised

Supplied with
Attribute Value
Supplied with


Manuals & Downloads

Reviews & Awards

Latest Reviews
HiFi Critic, Dec 2014
"streaming really does not come with much higher definition than this"
What Hi-Fi? Sound & Vision, Oct 2014
"This is quite simply the best network music player we've ever heard"
David Price, Sep 2006
"the best Compact Disc player I've heard to date, bar none!"
Martin Colloms, Aug 2006
"We introduce what could be the Porsche Carrera of players"
Hi-Fi World, Dec 2005
"the CD555 doesn't try to play DVDs, DVDs As, or SACDs. It doesn't have a digital output. The CD555 just plays CDs and at that it excels".
What Hi-Fi? Sound & Vision, Sep 2005
"Complex music is delivered effortlessly but, importantly, without curbing the seismic bass and dynamic contrasts"
5 Globes
5 Stars

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