Naim Audio NPX 300 black
Complementary product
Overview
The Naim Audio NPX 300 represents a new generation of external power supplies designed specifically for the 200 and 300 series of the New Classic range. This separate 14.4 kg power supply draws on technical solutions inherited from the flagship 555PS DR model while offering unprecedented modularity through its two dedicated Burndy connectors.
A modular configuration derived from the 555PS DR
The NPX 300 draws directly on the developments made for the 555PS DR, Naim’s reference power supply initially designed for the CD555 player. The engineers in Salisbury have carried over several key innovations from this high‑end model, notably the strict separation of digital and analog power supplies via distinct Burndy cables.
Two Burndy connectors are fitted to the rear panel: Type 3 and Type 4. This configuration allows a single NPX 300 to power a preamplifier or a source as a whole, or to use two NPX 300 units for complete separation. In this dual configuration, the first NPX 300 handles only the digital sections via the Type 4 cable, while the second powers the analog stages via the Type 3. This modular approach removes any electrical point of contact between the digital and analog domains, pushing interference back as far as the mains sockets.
Burndy cables, multi‑pin military‑grade locking connectors, carry both signal and power simultaneously. Their double high‑conductivity copper shielding and 75 Ω characteristic impedance minimize electromagnetic interference over the standard 1.25‑meter run. The NPX 300 is supplied with a Power-Line Lite and the two required Burndy cables.
Six DR regulators at the heart of the system
The Discrete Regulator (DR) technology, the result of two years of development completed in 2012, is the driving force behind the NPX 300. Unlike standard integrated monolithic regulators, the DR is akin to a precision amplifier built around carefully selected discrete components.
The principle is based on amplifying a reference voltage derived from a subsurface Zener diode, the quietest component available for this function. This reference feeds a differential stage with a symmetric pair and a constant current source in the “tail,” ensuring excellent common‑mode rejection. A transistor configured in common‑emitter with an active load provides the voltage gain, while a composite follower replaces the push‑pull output stage found in conventional audio amplifiers. Nested feedback loops ensure stability in the presence of the high capacitances of the powered circuits.
The NPX 300 incorporates six of these DR regulators operating with a newly designed toroidal transformer. Each regulator benefits from its own mechanical decoupling from the chassis, eliminating any transmission of microphony. The compensation capacitors are polystyrene, like those used in Naim’s high‑end amplifiers, the smoothing capacitors are film types (never microphonic ceramic), and the decoupling uses tantalums rather than aluminum electrolytics. The critical feedback resistor in the amplifier stage is a discrete component individually selected.
This architecture delivers a near‑zero output impedance and minimal residual noise, even during sudden changes in current demand. The oversized transformer charges the capacitor banks faster than multiple smaller units, reducing the mains conduction angle and extending the period of disconnection from the grid.
Wide compatibility within the Naim range
The NPX 300 was developed primarily for the NSC 222 preamplifier‑streamer, the heart of the 200 series New Classic launched in 2023 for Naim’s 50th anniversary. When connected to the NSC 222, the NPX 300 disables the latter’s internal power supply, instantly eliminating a source of noise and freeing the preamplifier from any energy constraints.
This external power supply also works with all products from the 200 and 300 series, as well as earlier models such as the NDX 2 and the NAC-N 272, provided suitable Burndy cables are used. The flexibility of the NPX 300 therefore allows for progressive system upgrades without making previous investments obsolete.
A discreet micro‑USB port enables firmware updates, ensuring the unit remains up to date with future software developments. The white backlit Naim logo on the front panel indicates operating status.
Manufacturing details and system integration
The NPX 300’s 91.5 × 432 × 317.5 mm dimensions match exactly those of other New Classic components, creating a visually coherent ensemble when stacked. The 14.4 kg weight reflects the density of the internal components and the thickness of the aluminum panels.
Standby power consumption remains below 0.5 W, in line with European energy efficiency standards. The power supply accepts either 115 or 230 V at 50/60 Hz, making international use straightforward.
The internal mechanical decoupling and wire routing were optimized during extensive listening tests in Salisbury. Every detail, from the positioning of the regulators to the orientation of the vertically mounted film capacitors to reduce microphony, is the result of listening validation by the teams led by Naim’s technical director.
A British design philosophy
The understated aesthetics of the NPX 300 are firmly in the Naim tradition: no superfluous ornamentation, only what contributes to sonic performance. The front panels, machined from 20 mm billets of solid aluminum, combine mechanical robustness with visual neutrality. This minimalist approach, initiated by Julian Vereker, rejects passing fashions in favor of functional design intended to last for decades.
Roy George, technical director since 2000, continues this philosophy of balanced Audio Engineering, which recognizes the critical interdependence between mechanics and electronics. The merger with Focal‑JMLab in 2011, followed by integration into the Vervent Audio Group in 2014, has not altered this approach, which remains focused on timing, temporal coherence, and musical flow rather than conventional measurement parameters.
The NPX 300 fits into this continuum while embracing technical modernity. Its modular design and upgradability reflect a mature understanding of the changing needs of music lovers, from entry‑level systems to reference setups requiring full separation of the analog and digital domains.
Technical specifications
Power supply
- Type: Mains power
- Mains voltage: 115 V or 230 V, 50 / 60 Hz
- Standby power consumption: < 0.5 W
Connectivity
- Power outputs: Type 3, Type 4
- Update port: Micro-USB
Physical characteristics
- Dimensions (H × W × D): 91.5 × 432 × 317.5 mm
- Weight: 14.4 kg
Design
- Naim logo: White backlighting
Included accessories
- Supplied cables: Power-Line Lite, Burndy Type 4 cable, Burndy Type 3 cable
Frequently Asked Questions
Can I use the NPX 300 with my older Naim network player?
The NPX 300 is compatible with the NDX 2 and NAC-N 272, as well as with all products from the 200 and 300 New Classic series. You simply need to ensure you have the appropriate Burndy cables for your specific configuration, as different models require different connectors (7, 9, 19, or 23 pins depending on the case). Your Naim dealer will be able to identify exactly which cables you need.
How does the dual NPX 300 power configuration work?
In a dual configuration, each NPX 300 connects via a separate Burndy cable: one powers the digital sections (Type 4), the other the analog stages (Type 3). This complete separation eliminates any electrical interaction between the two domains right up to the mains sockets. The gains in clarity, transparency, and dynamics justify this investment for those seeking the maximum performance from their system.
What is the difference between the NPX 300 and the 555PS DR?
The 555PS DR remains Naim’s reference power supply, with its 40% larger transformer, seven distinct regulated voltages, and a design optimized for the CD555 and ND555 players. The NPX 300 offers six DR regulators in a more accessible format, designed specifically for the 200 and 300 New Classic series. It nonetheless shares the essential innovations of the 555PS DR, including digital/analog separation via dedicated Burndy cables and Discrete Regulator technology.
What do the Type 3 and Type 4 connectors on the NPX 300 mean?
These designations identify the two 23‑pin Burndy outputs on the NPX 300. Type 3 carries the analog power supplies, Type 4 the digital power supplies. With a single NPX 300, both cables connect to the same device for a global improvement. With two NPX 300 units, each specializes in one domain, maximizing separation and minimizing crosstalk. This architecture mirrors that of the 555PS DR used with the ND555.
- Eco-contribution of €2.58 included in the sale price.
- GTIN / EAN: 5056351704055