Naim NAC 552 / NAP 500 DR review

The original Naim NAP 500 power amplifier was launched in the year 2000, with the NAC 552 preamplifier joining it in 2002. For more than a decade, this combination was the pinnacle of Naim amplifier performance, and was usurped only when the company launched its ultra-high-end Statement combination in 2014.

Today, that Statement pre/monobloc pairing costs a cool £234,997 / $299,997 / AU$440,000, so there certainly remains plenty of leeway for the NAC 552/NAP 500 DR to thrive.

Given that these 500 series products launched almost a quarter of a century ago, it seems natural to wonder how competitive they are against current rivals. You have already seen the star rating, so you know the answer to that.

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However, you should also know that neither product has remained unchanged over the years. Each enjoyed a huge performance boost when Naim added its Discrete Regulator (DR) technology into the respective power supply designs around a decade ago.

It is also worth noting that, while the world of consumer electronics in general moves at a lightning pace, mature technologies such as analogue electronics tend to progress glacially at best. As a result, a well-engineered, no-compromise design from decades ago can still compete at the highest level, as this four-box stereo amplifier proves.

Features

Judged on specifications, the NAC 552 preamplifier (£26,999 / $34,999 / AU$56,500) looks as basic as they come. It is a line-level unit, so if you need a phono stage, digital inputs or Bluetooth connectivity, you will need to add those as outboard boxes.

It isn’t quite from the Stone Age, however, so you do have a remote control.

At least there are plenty of inputs, though all of them are single-ended. Naim’s engineers didn’t see the benefits of including balanced connections on a domestic product when this preamp was designed. The company’s latest 200 and 300 series products, interestingly, do include the option.

Look on the back panel and you will find seven of the company’s long-favoured DIN connectors and two conventional stereo RCA pairs. So, a choice of nine input connections; but look at the front panel and you will find only six input buttons. What gives?

Each input button can be linked to any of the rear-panel connectors, which is the kind of flexibility we didn’t expect in what is otherwise a purist product. Equally, there are multiple line-level outputs for those who still use a recorder, be it reel-to-reel, cassette or digital.

There are two rows of buttons on the NAC 552’s front panel. The top line selects what you listen to, and the lower row decides the source to be recorded – the two work independently, which is handy.

To the left of the buttons, there are dials for volume and balance; these connect to carefully selected motorised potentiometers. No issue with that in principle, though the volume control in particular works in an abrupt way that makes small changes at low levels harder to perform than they should be.

The NAP 500 DR (£26,999 / $34,999 / $53,000) is more limited on the connection front, as power amplifiers usually are. Its input is a three-pin XLR per side, but only two of the pins are connected, so it's a single-ended link. Naim supplies a dedicated lead. A word of warning: if you get the left and right-channel leads mixed up, all you will hear is silence.

Design & build

Take a look inside the NAC 552 preamp and you will find that the sensitive audio circuits are mounted on a heavy brass suspended subchassis to minimise any sonic degradation caused by external vibrations. The assembly sits on springs and floats pretty freely, so the preamp shouldn’t be moved around without the four transit bolts being in place to avoid damage.

The preamp’s power supply is housed in an outboard unit called the 552 PS. Separating the audio and power-supply sections in this way reduces any unwanted mechanical or magnetic interactions.

This external supply weighs in at a robust 13.9kg (compared with the preamp’s 12.9kg) and features a hefty 800VA toroidal transformer. Electrically, it is a split-rail design that connects to the NAC 552 via a multi-pin Burndy cable and Naim’s Snaic 5 (DIN) lead.

The two-box approach continues with the NAP 500 DR power amplifier. Its outboard supply, the NAP 500 PS, packs a massive 1100VA toroidal mains transformer, delivering no fewer than 12 DC feeds, each dedicated to specific parts of the amp’s circuit. The connection between the NAP 500 DR and the power supply is also done using Burndy cables, in this case, a pair.

The Class A/B NAP 500 DR is something of a powerhouse, rated at 140 watts per channel into an 8-ohm load. While this is a pretty generous figure, in reality, this beast sounds considerably more muscular than even that number suggests – but more on that later.

Like the preamp, the NAP 500 DR is a beautifully made unit inside and out, just as we would expect at this level. Its casing opens on both sides in a dramatic gull-wing manner, revealing the internal circuitry.

We note that both these Naims have admirably neat circuit layouts and display obsessive attention to detail when it comes to housekeeping things such as cable routing. Both units are packed with quality discrete components rather than ICs – a deliberate choice made on performance grounds.

Compatibility

An amplifier at this level clearly needs a first-class partnering system. If there are any doubts about your source or speakers, get those sorted out before even thinking about getting this pre/power. This Naim combination is utterly ruthless at exposing flaws, particularly in source components, so it pays to ensure those you use allow the amplifier to shine.

Our reference system already features the Naim ND555/555 PS DR music streamer, which is the natural partner for this amplifier. We also connect a Technics SL-1000R/Kiseki Purpleheart MC record player feeding a Cyrus Phono Signature/PSX-R2 phono stage to play our records. Our reference Burmester 088/911 MkIII amplifier serves as a good benchmark for this Naim pairing.

As for speakers, our usual ATC SCM50 are pressed into service alongside JBL’s excellent Summit Ama and the Fyne Audio F1-8 standmounters. We use Naim’s own Super Lumina interconnects alongside the company’s NAC A5 speaker cable, as well as our usual premium Chord Company and Vertere leads.

Once everything is up and running, we’re pleased to note that neither Naim unit gets particularly hot in use. So, while we would still recommend placing them in a rack with plenty of ventilation, heat build-up is unlikely to be an issue.

Sound

Ever heard the Radiohead song Everything In Its Right Place? It's an absorbing piece of music, but also a fitting description of this Naim combination’s sound. This amplifier is wonderfully organised and stable. Every instrumental note, vocal track and sound effect gels seamlessly to produce a musical whole that seems more than the sum of its parts.

It is a crisp, direct and bold presentation, one concentrating on conveying the physical aspects of the music while still having the refinement necessary in this part of the market. There is a pleasing no-nonsense quality to the presentation, where the amplifier’s control and composure makes the music feel almost simplified, so effortless does it all seem.

Corny as it sounds, listening to the Naim in full flow feels as though we have a direct link to the music’s emotional core, making it difficult to step back to analyse the results. This combination simply does what an amplifier should, and that’s to make the signal louder without corrupting it in any significant way.

For this to happen, certain qualities have to be present, and in this regard, the NAC 552/NAP 500 DR tick all the boxes. This amplifier sounds impressively transparent, allowing the quality and character of the source and recording to shine through. Excellent detail resolution should be a given at this level, and the Naim duly obliges. Importantly, the verve and energy in the music aren’t diluted, as can often happen in the search for ever-greater levels of insight and clarity.

Listen to a demanding track such as Beethoven’s Fifth Symphony and the Naim pairing is happy to let you follow an individual instrumental strand, or simply to sit back and enjoy the experience. The symphony’s savage dynamic sweeps are delivered with ferocity coupled to a degree of authority that eludes all but the very best.

That claimed 140-watts-per-channel figure is healthy, but barely hints at the muscle on offer here. Naim watts, it seems, are different from others.

Yet power is only part of the equation. This pairing’s impressive detail-resolution translates into convincingly realised instrumental textures. There is delicacy where required, of course, but also a sense of palpability that’s uncommon.

The same applies to voices. Mount The Air by The Unthanks is a lovely, natural-sounding recording, and the Naim reveals the full scope of the group's immaculate vocals with real finesse.

Tonally, we have no complaints. This four-box is essentially neutral and refuses to favour any part of the frequency range over another. It sounds authentic in a way that eludes much of the competition.

Our reference Burmester 088/911 MkIII shows that it is possible to have a more spacious soundstage, but the Naim counters with class-leading image solidity and focus. Instruments are sharply rendered and locked in position, even when the music gets demanding. To our surprise, the Burmester pairing sounds a little blurred in comparison.

Naim’s products are famed for their rhythmic ability, and the NAC 552/NAP 500 DR is as exceptional as we had hoped for. When asked to play Massive Attack’s Angel, this amplifier doesn’t hold back, delivering a feeling of unstoppable momentum coupled to a full dose of the song’s brooding menace.

Lows are delivered with a thrilling mix of power, agility and grip. It’s an enthralling performance; one which leaves us luxuriating in the music rather than thinking about the mechanics of hi-fi.

Verdict

25 years is a long time for any product to be in production. Having talked to Naim’s representative, there is no sign that this pre/power is going to be put out to pasture anytime soon. We are glad of that.

The Naim NAC 552/NAP 500 DR pairing remains an exceptional performer and is up there with the best we have heard at this level. Highly recommended.

Review published: 18th May 2026

SCORES

• Sound 5
• Build 5
• Features 3

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