Naim Audio NSS 333

Naim Audio NSS 333 is a network player from the Classic 300 series, offering a refined streaming platform paired with a carefully developed digital-to-analog conversion section. It delivers faithful reproduction of musical details, highlighting the rhythm, dynamics, and expressiveness of recordings. Thanks to its comprehensive connectivity and clear interface, the NSS 333 meets the expectations of music lovers wishing to explore their library and streaming services with controlled sound quality.

The Naim Legacy in a Modern Chassis

The NSS 333 features the distinctive design of Naim Audio’s Classic 300 series, with a solid aluminum chassis and cooling fins that give it a robust yet elegant look. This design is not just aesthetic: it contributes to the device’s mechanical stability and heat dissipation, both essential factors for optimizing audio performance.

On the front, a 5.5-inch color display shows information about the current playback, complemented by four quick-access buttons for essential functions. The rear panel reveals a wealth of available connections: analog XLR, RCA, and DIN outputs, optical and coaxial digital inputs, USB ports, and network connections. This versatility allows the NSS 333 to be integrated into virtually any existing audio setup.

Attention to detail is also evident in the internal design. The audio and control circuits benefit from galvanic isolation to prevent interference. The custom 4-winding toroidal transformer is paired with a soft-start circuit to minimize electrical disturbances. Even the Wi-Fi antennas have been carefully considered, being integrated into the heat sink with a patented design (GB2524815B) that optimizes reception while limiting interference.

A Complete Musical Control Center

The NSS 333 excels at its primary function: providing access to an almost unlimited musical universe. Its NP800 streaming board with symmetrical LVDS digital signals ensures low-noise transmission of audio data. This architecture allows you to fully enjoy major music streaming services: Spotify Connect, Apple Music, Tidal (with Tidal Connect support), Qobuz, and Internet radio.

Connectivity doesn’t stop there. The NSS 333 supports AirPlay 2 and Chromecast protocols for wireless streaming from smartphones and tablets. Roon Ready certification guarantees seamless integration into this sophisticated audiophile ecosystem. For users with a local music library, support for UPnP servers and USB devices makes it easy to access files stored on a NAS or USB drive.

The multiroom function is a major asset for those who want to deploy their audio system in several rooms. The NSS 333 integrates perfectly with other Naim streaming products, from Mu-so speakers to Uniti systems, allowing for synchronized or independent playback as needed. This flexibility turns the NSS 333 into a true nerve center of a complete home audio system.

The Art of Digital Conversion

The NSS 333’s exceptional sound quality is based on a sophisticated digital processing chain. At the heart of this process are two fixed-frequency master clocks (44.1 kHz and 48 kHz) that ensure optimal timing stability, essential for minimizing jitter and preserving audio signal integrity.

Digital processing benefits from a proprietary Naim DSP running at 705.6 kHz/768 kHz with full upsampling. This 40-bit floating-point SHARC processor enables precise signal processing before analog conversion. For S/PDIF inputs, a DSP RAM buffer effectively eliminates jitter caused by modulation, ensuring more faithful reproduction of digital recordings.

Digital-to-analog conversion is handled by a PCM1791A DAC operating in external filter mode. This choice may seem surprising in a device of this level, but Naim selected it after extensive listening tests, finding it superior to more expensive options. The converted signal then passes through discrete class A operational amplifiers and custom filters. The post-DAC filter components, made of ultra-low dielectric absorption polystyrene, help preserve signal purity.

This processing chain allows the NSS 333 to faithfully reproduce PCM files up to 32-bit/384 kHz and DSD128, thus covering almost all high-resolution formats currently available.

An Intuitive User Experience

The NSS 333’s technical excellence is matched by a carefully designed user interface that makes accessing music as simple as it is enjoyable. The 5.5-inch color display clearly shows information about the current playback, album covers, and navigation menus.

Control can be achieved in several ways. The front panel buttons provide quick access to essential functions: standby, play/pause, input selection, and favorites. The bidirectional ZigBee RF remote control offers greater freedom of use, operating without the need for direct line of sight to the device. This technology also allows control of other compatible Naim devices, such as the NAC 332 preamplifier NAC 332.

The Focal & Naim app, available for iOS and Android, turns smartphones and tablets into sophisticated remote controls. It provides access to all NSS 333 features, streaming services, and enriched music information via the Rovi database (artist biographies, album reviews, recommendations). The consistent interface across all Naim products, from Mu-so to Classic systems, makes it easy for users familiar with the ecosystem to get started.

Configurable inputs, with the ability to rename or disable unused ones, allow the interface to be customized to the specific needs of each setup. Wireless software updates via the app ensure that the NSS 333 stays up to date with the latest features and fixes.

Evolution and Integration into the Naim Ecosystem

The NSS 333 is part of Naim Audio’s cherished philosophy of upgradability. Its main upgrade path lies in adding the external NPX 300 power supply, connected via two Burndy cables (one for digital circuits, one for analog circuits). This separation of power supplies significantly reduces background noise and improves dynamics, definition, and spatialization.

Integration into a complete Naim system reveals the full potential of the NSS 333. Optical inter-product communication via 3.5 mm jacks allows for synchronized standby and lighting with compatible power amplifiers such as the NAP 250 or NAP 350. The ZigBee remote can control the NAC 332 preamplifier, creating synergy between components.

Compared to previous generations of Naim streamers, the NSS 333 marks a significant evolution. Reviews highlight a more detailed sound presentation, a more defined midrange, and a more impressive soundstage in both depth and width. The treble is crisper without the harshness sometimes criticized in earlier models. These improvements are attributed to the application of technologies developed for the Statement series, Naim’s flagship, which have been adapted for the 300 series.

Technical Specifications

Connectivity and Streaming

• Compatible services: Spotify Connect, Apple Music, TIDAL and TIDAL Connect, Qobuz, Internet radio
• Supported protocols: AirPlay 2, Chromecast, UPnP servers, USB key
• Roon Ready certification for integration into advanced high-fidelity systems
• Multiroom function with all Naim streaming products

Digital Processing and Conversion

• NP800 streaming board with symmetrical LVDS digital signals for low noise
• Clock system:
  • Two fixed master clocks (44.1 kHz and 48 kHz) for optimal stability
  • Operates in master clock mode for streaming services
• Digital processing:
  • Exclusive Naim DSP with 705.6 kHz / 768 kHz digital filter
  • 40-bit SHARC floating-point DSP processor
  • DSP RAM buffer for S/PDIF inputs, eliminates noise related to modulation
• Digital-to-analog converter:
  • PCM1791A DAC operating in external filter mode
  • Class A output stages
  • Ultra-low dielectric absorption polystyrene post-DAC filter components

Interface and Control

• 5.5-inch color display with four quick access buttons (standby, play/pause, inputs, favorites)
• Bidirectional ZigBee RF remote control, usable without direct line of sight (Zigbee RF4CE)
• Focal & Naim app:
  • Control from smartphone/tablet (Android, iOS)
  • Access to playlists and streaming services
  • Enhanced music information via Rovi database (biographies, reviews, recommendations)
• Configurable inputs with deactivation option
• Updates via wireless connection through the Focal & Naim app

Multiroom Features

• Compatible with all Naim streaming products
• Multi-room management via a single app
• Seamless synchronization between devices
• Multiroom streaming (simultaneous playback on multiple streamers)
• Party mode (synchronization of up to 6 Naim streamers)

Supported Audio Formats

• WAV: up to 32 bit / 384 kHz
• FLAC and AIFF: up to 24 bit / 384 Hz
• ALAC (Apple Lossless): up to 24 bit / 384 Hz
• MP3: up to 48 kHz, 320 kbit (16 bit)
• AAC: up to 48 kHz, 320 kbit (16 bit)
• OGG and WMA: up to 48 kHz (16 bit)
• DSD: 64 and 128 Fs
• M4A: up to 48 kHz, 320 kbit (16 bit)
• Gapless playback supported on all formats
• Internet radio formats: Windows Media, MP3, ACC, OGG Vorbis streams, and MMS content

Audio Performance

• High-precision digital sound
• Digital crosstalk: 94 dB at 1 kHz, volume at 0 dB
• Digital frequency response: 3 Hz to 27 kHz -3 dB
• Digital distortion: 0.002% at 0 dBFS, 1 kHz, volume at 0 dB
• Digital signal-to-noise ratio: 108 dB ref. 0 dBFS A-wtd, volume at 0 dB
• Automatic standby after 20 min of inactivity

Connections

• Analog outputs:
  • 1 pair XLR (2.1 Vrms)
  • 1 pair RCA (2.1 Vrms)
  • 1 DIN 5-pin
• Digital inputs:
  • 2 TOSLINK optical (up to 24 bit / 96 kHz)
  • 1 RCA coaxial (24 bit / 192 kHz, DoP 64 Fs)
  • 1 BNC coaxial (24 bit / 192 kHz, DoP 64 Fs)
• Digital outputs: 1 BNC coaxial (up to 24 bit / 192 kHz)
• Other connections:
  • 3.5 mm optical output for synchronized control of compatible products (e.g. NAP 250 / 350)
  • 2 USB type A ports (front and rear - 1.6 A)
  • Analog input
  • HDMI ARC

Network

• Ethernet: 10 / 100 Mbps
• Wi-Fi: 802.11 b/g/n/ac integrated into the heatsink (patent GB2524815B)
• Bluetooth: BLE v4.2

Power Supply and Consumption

• Main power supply: 115 V or 230 V, 50 / 60 Hz
• Power consumption:
  • In standby (deep sleep): < 0.5 W
  • In network standby: < 2 W
  • In normal use: 25 W

Physical Characteristics

• Dimensions:
  • Width: 43.2 cm
  • Height: 9.15 cm
  • Depth: 31.75 cm
• Weight: 11 kg
• Product type: streamer

Compatibility and Accessories

• Compatible cables: Super Lumina
• Power supply options: NPX 300
• Upgrade products: ND 555
• Included accessories:
  • Power cable
  • 5-pin DIN 180° cable