NAD BluOS Streaming DAC
The NAD C 658 BluOS Streaming DAC is a versatile digital hub that combines a high-resolution streamer, precision DAC and digital preamplifier in one refined component. With BluOS built in, it offers seamless access to streaming services and multi-room audio, while Dirac Live room correction optimises performance for your space. Its all-digital architecture ensures clean, detailed playback, supported by flexible connectivity including balanced outputs, phono input and Bluetooth. Designed for modern hi-fi systems, the C 658 delivers clarity, control and long-term upgradeability.
Available with Professional installation in NY, NJ, and CT – Powered by Sound Waves .
The NAD C 658 BluOS Streaming DAC redefines what a Classic Series component can be, combining a high-performance network streamer, precision DAC, and digital preamplifier in one flexible platform.
With BluOS built in, the C 658 provides seamless access to streaming services and local music libraries, while Dirac Live Room Correction optimises performance for any listening environment.
Designed for long-term flexibility, it remains a powerful hub for modern two-channel systems.
Key Features
- BluOS streaming with multi-room capability
- High-performance DAC for detailed playback
- Dirac Live Room Correction (upgradeable)
- Fully digital preamplifier architecture
- Balanced and unbalanced outputs
- Adjustable subwoofer crossover and bass management
- MM phono input and multiple digital inputs
- Dual MDC slots for future expansion
- Two-way aptX HD Bluetooth
- Ethernet and dual-band Wi-Fi connectivity
High-Resolution Streaming with BluOS
BluOS enables seamless access to streaming services, internet radio, and local music libraries with high-resolution playback.
The intuitive BluOS Controller app allows easy control across single or multi-room systems.
Flexible Connectivity for Modern Hi-Fi
The C 658 offers a wide range of analogue and digital inputs, including balanced outputs and subwoofer connections.
It integrates easily into existing systems while maintaining low-noise, high-precision signal handling.
Precision Digital Processing
The all-digital signal path ensures consistent, clean playback across all inputs.
A high-performance DAC and digital volume control preserve detail and minimise distortion.
Dirac Live Room Calibration
Dirac Live optimises sound for your listening space by correcting timing and frequency response.
This results in improved clarity, imaging, and overall balance for a more natural listening experience.
Line Input / Pre-Out
| THD (20 Hz – 20 kHz) | <0.005% (2V out) |
| Signal-to-noise ratio | >106 dB |
| Channel separation | >80 dB (1 kHz) / >70 dB (10 kHz) |
| Input impedance | 22 kΩ + 100 pF |
| Maximum input signal | >4.5 Vrms |
| Output impedance | Source Z + 240 Ω |
| Input sensitivity | 93 mV |
| Frequency response | ±0.3 dB (20 Hz – 20 kHz) |
| Maximum voltage output | >4.5 V |
| Tone controls |
Treble: ±7 dB @ 20 kHz Bass: ±7 dB @ 60 Hz Balance: -10 dB |
Phono Input / Audio Pre-Out
| THD (20 Hz – 20 kHz) | <0.01% (2V out) |
| Signal-to-noise ratio |
>84 dB (200 Ω source) >76 dB (MM cartridge) |
| Input sensitivity | 1.44 mV |
| Frequency response | ±0.3 dB (20 Hz – 20 kHz) |
| Maximum input signal | >80 mVrms (1 kHz) |
Headphone Output
| THD (20 Hz – 20 kHz) | <0.005% (1V out) |
| Signal-to-noise ratio | >110 dB (32 Ω load) |
| Frequency response | ±0.3 dB (20 Hz – 20 kHz) |
| Channel separation | >60 dB (1 kHz) |
| Output impedance | 6 Ω |
DAC
| Supported formats | MP3, AAC, WMA, OGG, WMA-L, ALAC, OPUS |
| Hi-res formats | MQA, FLAC, WAV, AIFF, DSD (via BluOS app) |
| Sampling rates | Up to 32-bit / 192 kHz |
| Bit depth | 16 – 24 bit |
BluOS
| Supported OS | Windows, macOS |
| Mobile app | BluOS (Android & iOS) |
| Streaming services | Spotify (incl. Connect), Amazon Music, TIDAL, Deezer, Qobuz, HDTracks, Napster, KKBox, Bugs |
| Internet radio | TuneIn, iHeartRadio, Calm Radio, Radio Paradise |
| Bluetooth | aptX HD (two-way: transmit & receive) |
| Network | Gigabit Ethernet, Wi-Fi 5 (802.11ac/n) |
Dimensions & Weight
| Dimensions (W × H × D) | 435 × 100 × 405 mm |
| Shipping weight | 10.1 kg |
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