That word keeps appearing. Alive. It is not a technical description. It is an experience, and it is the reason a second-hand Nait holds its value better than almost any other integrated amplifier at any price point, and the reason you will find serious listeners on their third or fourth one.
This is the story of what the Nait is, where it came from, and how to find the right version for your system.
Where it came from
Naim Audio was founded in Salisbury in 1973 by Julian Vereker, an engineer and racing driver with strong opinions about what amplification should do. Vereker believed that the standard measurements used to evaluate amplifiers, total harmonic distortion, signal-to-noise ratio, frequency response, told you very little about whether music played through them would engage you. He was right, and building a company around that conviction was either brave or reckless depending on how you looked at it.
The original Nait arrived in 1983. The name stood for Naim Audio Integrated, and it delivered 15 watts per channel. In a market where rival manufacturers were competing on power output, this was not a lot. In practice it did not matter, because the Nait did something those rivals struggled to match: it made music feel urgent and present and rhythmically compelling at volumes that would not disturb a neighbour, let alone fill a concert hall.
Vereker talked about timing. About the way music breathes and moves. About the difference between an amplifier that reproduces a signal and one that communicates a performance. The Nait was his argument made physical, and the hi-fi community responded. Within a few years it had become the integrated amplifier that Linn LP12 owners paired with their turntables when they wanted to keep the system simple without compromising what they heard.
The philosophy behind the sound
To understand why the Nait sounds the way it does, it helps to understand what Naim was trying to achieve and what they were deliberately not trying to achieve.
Most amplifier designers work to minimise distortion and maximise bandwidth, then optimise the power supply as a supporting element. Naim inverted this. Vereker and his team treated the power supply as a primary design consideration, not a footnote. The original Nait had a power supply that was generous relative to its output stage, and subsequent versions have continued this emphasis on getting the power supply right as a precondition for everything else.
The result is an amplifier that does not flatten the dynamic peaks and troughs in music. When a drummer hits a snare with real force, the Nait's supply can deliver the current required without sagging, and the transient arrives with its full weight intact. This is not something that shows up dramatically in a frequency response graph. It is something you hear immediately when you listen.
Naim also took a deliberately purist approach to the signal path. Early Naits had no tone controls, no balance control, minimal switching. The fewer components between the input and the speaker terminals, the reasoning went, the less the signal was modified in transit. This was not a fashionable position in 1983. It remains a defensible one forty years later.
The versions worth knowing about
The Nait family has grown considerably since 1983, and choosing the right version for a pre-owned purchase means understanding what changed along the way.
The original Nait (1983) and Nait 2 (1988) are genuinely historical objects at this point. They sound extraordinary when properly maintained, but they are now old enough to require careful attention to service history. If you are buying one of these, the capacitors will almost certainly need replacing and the cost of a professional service should be factored into the price. For a collector or an enthusiast who knows what they are doing, they represent something irreplaceable. For a first Naim purchase, look further along the timeline.
The Nait 5 and Nait 5i (2001 onwards) are where most people find their entry point into used Naim, and with good reason. The 5i in particular is one of the finest integrated amplifiers British hi-fi has produced at its price point. Fifty watts per channel, a built-in MM phono stage, a genuine Naim power supply, and the musical character that the brand has always stood for. The 5i ran from 2004 to 2012 and was followed by the 5si, which added refinements rather than changing the fundamental character. These are plentiful on the pre-owned market, they are within reach of a realistic budget, and they will improve almost any system they are placed into.
The Nait XS, XS 2 and XS 3 sit above the 5i and represent a step into more serious territory. The XS series offers higher current delivery, a more refined power supply, and the option to add the Naim HiCap external power supply as an upgrade. If your speakers are demanding or your room is large, the XS is the version to look for.
The Nait 50 (2023) was a limited edition of 750 units produced to mark Naim's 50th anniversary. It returned to the visual language of the original while delivering 50 watts through a thoroughly modern circuit. If you find one on the pre-owned market, it will not be inexpensive, but it is a genuinely special object.
What to watch for when buying used
Naim amplifiers are well built and tend to last, but there are things worth checking before you commit.
Service history is the first question. Naim recommends that their amplifiers are serviced every 10 to 12 years, primarily to replace the electrolytic capacitors, which age over time regardless of use. An amplifier that has not been serviced within this window will still work, but it may not be performing as Naim intended, and the cost of a service should be reflected in the asking price. A serviced unit with documentation is worth paying more for.
The volume control on older Naits can develop a crackling or intermittent behaviour over time. This is usually a cleaning issue rather than a component failure and is straightforward to address, but it is worth knowing about. Listen carefully through the volume range when you audition.
Check the speaker terminals and input sockets. Naim uses both standard phono (RCA) sockets and DIN connectors, depending on the model and era. Make sure you know which connections you have before you buy, particularly if you are planning to use existing interconnects.
Finally, check for the original remote control if the model you are buying includes one. The Nait 5i series remotes are specific to Naim and replacements are harder to find than for more mainstream brands.
Is it right for your system?
The Nait works best with speakers of reasonable sensitivity. Naim amplifiers are designed around current delivery rather than raw voltage swing, which means they can drive a demanding load effectively, but they are particularly well matched to speakers in the 87dB and above sensitivity range. Linn, Neat, ProAc, and Harbeth all partner well with Naim amplification, and this is not a coincidence.
Speaker cable matters more with Naim than with most amplifiers. The company designs their power stages around a minimum cable inductance, and using very short or very low-inductance cables can cause instability. The practical advice is to use at least 3.5 metres of Naim's own NACA5 cable per channel, or an equivalent with similar inductance characteristics. This is not a sales pitch for expensive cable: it is a genuine circuit design consideration.
If you are building a system around a Nait and a turntable, the natural partners are a Rega or Linn deck. The Nait 5i's built-in phono stage is matched for MM cartridges and works particularly well with Rega's Elys and Exact cartridges. This combination, bought pre-owned, represents one of the best-value serious hi-fi systems available at any price.
Why it keeps appearing on the used market
People sell Naim Naits for one reason most of the time: they are buying a bigger one. The amplifier rarely disappoints in the way that sends someone back to a different brand. It gets upgraded because the listener has been converted rather than dissatisfied, and the step to an XS or a Supernait follows naturally from the experience of living with a 5i.
This is good news if you are looking for one. Used Naits are well-cared-for because their owners care about them. They are available regularly because Naim's upgrade path is clear and well-trodden. And they perform at a level that their pre-owned prices do not reflect.
Browse our current Naim stock at 2ndhandhifi.co.uk
For the dedicated enthusiast
If you already know your way around Naim equipment, here is where it gets more specific.
DIN vs RCA. Naim's preferred interconnect standard is the five-pin DIN connector rather than the standard phono socket. This is not stubbornness. The DIN standard provides a dedicated ground connection that the phono socket does not, which reduces the ground loops and interference that phono interconnects are susceptible to. On a Naim system, DIN to DIN connections genuinely sound better than phono to phono in most cases. If you are connecting a non-Naim source to a Nait, a quality DIN to phono lead is worth using rather than adapting at the amplifier end.
The SNAIC. On older Naim systems and certain current products, the SNAIC (Signal, Negative And Interconnect Cable) carries both the audio signal and the power supply connection between units. This is a Naim-specific arrangement that allows a source component like the CD5 or NAT05 to be powered from the amplifier's regulated supply rather than drawing from the mains independently. The sonic benefit is real but requires the cable to be Naim's own. Third-party SNAICs exist but vary in quality.
Capacitor service. Naim uses large-value electrolytic capacitors in their power supplies and these age over time, gradually losing capacitance. A Nait 5i that has never been serviced will still play music, but its power supply is no longer delivering what it was designed to deliver. Naim and several independent specialists offer a full recap service. The cost is typically between £150 and £250 depending on the model and is absolutely worth it on any unit more than ten years old. A freshly serviced older Nait is in many respects a new amplifier.
The HiCap upgrade. The Nait XS, XS 2 and XS 3 all accept Naim's HiCap external power supply via a SNAIC connection. The HiCap takes over the power supply duties for the preamplifier stage, freeing the internal supply to concentrate on the output stage. The improvement is not subtle. If you are buying an XS-series Nait and there is a HiCap available at a sensible price, it is worth treating them as a pair.