Naim ND555 Network Audio Player & Naim NAPS 555 DR
Naim ND555 Network Audio Player & Naim NAPS 555 DR
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Score: 5 / 5 Mint
The Naim ND 555 is a flagship 500 Series network audio player designed for reference-grade streaming systems. Engineered to partner with Naim Statement or 500 Series amplification, the ND 555 incorporates Naim's NP800 streaming architecture with low-voltage differential signaling (LVDS), a 40-bit SHARC DSP engine, and dual Burr-Brown® R2R ladder DACs. The internal analog and digital stages are isolated on heavy brass sub-chassis suspended on tuned springs to minimize microphonic vibration.
Operating exclusively with external Naim power supplies—such as the included flagship 555 PS DR—the ND 555 isolates sensitive audio circuitry from mains transformer radiation. The 555 PS DR utilizes Naim’s Discrete Regulator (DR) technology across seven regulated DC supply rails, powered by a massive toroidal transformer. Controlled via the Focal & Naim app, Zigbee remote, or front panel, the system supports high-resolution PCM up to 32-bit/384 kHz, native DSD128, Roon Ready certification, AirPlay 2, Chromecast, and direct TIDAL, Qobuz, and Spotify streaming.
KEY FEATURES & PROPRIETARY TECHNOLOGIES
- Master DAC Clocking & NP800 Streaming Card: Naim's NP800 network board allows the master DAC clock to control system data flow, eliminating timing errors and jitter.
- 40-Bit SHARC DSP & Burr-Brown® R2R Ladder DACs: Signals are 16x oversampled with 40-bit accuracy via a SHARC DSP before feeding true R2R multibit ladder converters.
- Low-Voltage Differential Signaling (LVDS): High-speed digital routing lowers noise radiation, signal distortion, and timing errors.
- Brass Sub-Chassis Suspension: Sensitive internal circuits and DAC boards are mounted to heavy brass plates suspended on tuned springs to mechanically decouple components from ambient microphony.
- Dedicated 555 PS DR Power Supply Architecture: Powered by an external 555 PS DR unit featuring seven isolated, discrete regulated DC rails and a massive low-noise toroidal transformer.
- Comprehensive High-Res Streaming & Multiroom: Supports UPnP, Roon Ready, Apple AirPlay 2, Chromecast, Qobuz, TIDAL, Spotify Connect, Internet Radio, and gapless audio playback up to 32-bit/384 kHz and DSD128.
SPECIFICATIONS
| Specification | Detail |
|---|---|
| Product Category | Flagship Network Audio Player & Reference Power Supply System |
| Brand / Series | Naim Audio — 500 Series |
| Model Designation | ND 555 (Network Player) + 555 PS DR (External Power Supply) |
| Digital-to-Analog Converter (DAC) | Burr-Brown® R2R Multibit Ladder DACs |
| Digital Signal Processor (DSP) | 40-Bit Floating Point Analog Devices SHARC DSP (16x Oversampling) |
| Internal Mechanical Isolation | Suspended Heavy Brass Sub-Chassis with Spring Isolation |
| Supported PCM Audio Formats | WAV (up to 32-bit/384 kHz), FLAC, AIFF, ALAC (up to 24-bit/384 kHz), MP3, AAC, OGG, WMA, M4A |
| Supported DSD Audio Formats | DSD64 (2.8 MHz) & DSD128 (5.6 MHz) |
| Digital Inputs | 2x Optical TOSLink (24-bit/96 kHz), 1x RCA Coaxial (24-bit/192 kHz, DoP64), 1x BNC Coaxial (24-bit/192 kHz) |
| Analogue Outputs | 1x Stereo RCA Pair, 1x 5-Pin DIN Output |
| Network & Streaming Protocols | Ethernet (10/100 Mbps), Dual-Band Wi-Fi (802.11a/b/g/n/ac), Roon Ready, AirPlay 2, Chromecast, UPnP |
| Integrated Streaming Services | TIDAL, Qobuz, Spotify Connect, Internet Radio |
| Wireless Input | Bluetooth |
| Power Supply (555 PS DR) Architecture | External Dedicated Unit | 7 Regulated Supply Voltages | Naim Discrete Regulator (DR) |
| Power Supply Dimensions (W x D x H) | 432 x 314 x 87 mm (17.0" x 12.4" x 3.4") |
| Power Supply Weight | 15.7 kg (34.6 lbs) |
| System Control | Focal & Naim App (iOS & Android), Zigbee Remote Control, Front Panel |
Pre-owned Terms & Condition
Pre-owned Terms & Condition
Our Grading Guarantee
All equipment listed on this site undergoes a multi-point inspection by our staff. While we use a standardised 1–5 Grading Scale, please note that "pre-owned" implies some degree of previous life. We strive for transparency and use the following terms:
- Visual Inspection: Condition grades are subjective but applied conservatively. We provide high-resolution photography of the actual unit for sale (no stock photos). We encourage buyers to zoom in on all images as they constitute part of the formal product description.
- Functional Testing: Unless labelled Grade 1 , all units have been tested for power, input/output integrity, and basic mechanical operation. Vintage units (20+ years) are tested for "period-appropriate" functionality; unless specified, internal components like capacitors are original.
- "Fair" Exclusions: Items graded 1 (Fair) are sold strictly for parts or repair. These items are ineligible for returns, refunds, or "Item Not as Described" claims regarding their condition.
- Return Window: If a unit arrives in a condition significantly different than its assigned grade (e.g., a Grade 4 unit arrives with a shattered faceplate), you must notify us within 24 hours of delivery.
Condition Grading Guide
Condition Grading Guide
Mint
Visually and mechanically indistinguishable from a new unit.
Excellent
Extremely clean. The item has been handled with care and shows only the slightest signs of use.
Very Good
Looks "used" but has been respected.
Good
Functional, but shows its age.
Fair
Functional, but may have some damage or missing parts.
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