ND 555 vs Boulder 2120
The 2120's bit depth is 32-bit against the ND 555's 24-bit and its signal-to-noise 115 dB against 108.1 dB. Both share max sample rate (384 kHz) and thd (0.001%).
AI-generated product photo — not official manufacturer imagery.
DigitalStreamersDACsHi-Res Players
About the ND 555
The Naim Audio ND 555 is a reference-level, fixed-output network music player and DAC from Naim’s 500 Series. It is designed for use with a separate preamplifier or integrated amplifier and requires at least one Naim NAPS 555 DR power supply; a second 555 DR supply may be added. Its architecture includes a 40-bit SHARC processing stage, Burr-Brown PCM1704K R2R DACs, discrete regulation, low-noise LVDS technology, and a suspended sub-chassis for the audio circuitry. It supports high-resolution network playback, USB storage, external S/PDIF sources, AirPlay, Chromecast, Bluetooth, Qobuz, TIDAL, Spotify Connect, UPnP, internet radio, and Roon. The ND 555 is not an integrated amplifier, preamplifier, phono stage, headphone amplifier, CD player, or music server with internal storage. Current manufacturer listings and documentation continue to identify the ND 555 as a supported product; therefore it is not confirmed to be no longer manufactured.
Specifications
Digital Audio
DAC capabilities and digital audio processing
- Bit Depth
- 24-bit
- Max Sample Rate
- 384 kHz
- DSD Support
- DSD128
- MQA Support
- No
- DAC Chip
- Burr-Brown PCM1704 R2R ladder DAC
Analog Output
Analog signal output specifications
- THD
- 0.001%
- SNR
- 108.1 dB
- Output Voltage
- 2.2V RMS
- Output Impedance
- 17Ω
Connectivity
Input and output connections
- Bluetooth
- Yes
- Bluetooth Codecs
- aptX HD
- Wi-Fi
- Yes
- Ethernet
- Yes
- Digital Inputs
- USB, Optical, Coaxial
Streaming Services
Supported streaming platforms and protocols
- AirPlay
- v2
- Chromecast
- Yes
- Roon Ready
- Yes
- Spotify Connect
- Yes
- TIDAL Connect
- Yes
Physical Dimensions
Size, weight, and appearance
- Weight
- 12.25 kg (27 lbs)
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions