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NAD C 658
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 major streaming services and local music libraries through the BluOS Controller app. Its all-digital architecture delivers clean, detailed playback from every source, while Dirac Live calibration—upgradeable to Full Frequency—optimises performance for any room. Built for long-term flexibility, the award-winning C 658 remains a trusted hub for modern two-channel systems.
Includes Dirac Live® Limited Bandwidth licence and calibration microphone for room correction up to 500Hz
- BluOS built in for high-resolution streaming and multi-room audio
- High-performance DAC stage for clean, detailed playback
- Includes Dirac Live® Limited Bandwidth licence and calibration microphone for room correction up to 500Hz, with licence upgradeable to Full Frequency
- Fully digital preamplifier architecture with low-noise signal path
- Balanced and single-ended outputs for flexible system integration
- Adjustable digital subwoofer crossover with bass management
- MM phono input plus line-level and digital inputs for legacy sources
- Dual MDC slots for optional future expansion, including HDMI and USB-DSD playback functionality
- Two-way aptX HD Bluetooth for wireless listening
- Gigabit Ethernet, dual-band Wi-Fi, and comprehensive control options
- Supports Dirac Live® Bass Control with optional licence purchase for advanced subwoofer optimisation
High-Resolution Streaming with BluOS (Section 1 of 4)
Equipped with BluOS, the C 658 provides seamless access to major streaming services, local music libraries, and high-resolution playback throughout the home. The BluOS Controller app makes it easy to browse and control music in one room or across a multi-room system. Designed for clarity and ease of use, BluOS gives the C 658 intuitive, app-based navigation that brings modern convenience to serious hi-fi listening.
Flexible Connectivity for Modern Hi-Fi (Section 2 of 4)
Designed to integrate effortlessly into high-end audio systems, the C 658 offers a wide range of analogue, digital, balanced, and subwoofer connections. Its digital-domain signal handling, adjustable bass management, and balanced outputs make it a precise, low-noise partner for any power amplifier. Whether pairing with external sources, turntables, or multi-room components, the C 658 unlocks the full performance of your existing system.
Precision Digital Processing (Section 3 of 4)
The C 658 maintains an all-digital signal path to preserve detail and consistency across all inputs. A high-performance DAC stage and digital-domain volume control minimise noise while maintaining transparency at any listening level. This careful design ensures clean, balanced playback from high-resolution streaming to traditional sources.
Dirac Live Room Calibration (Section 4 of 4)
As a Dirac Live component, the C 658 can be calibrated to your listening space using the included licence, with the option to upgrade to Dirac Live Full Frequency for more advanced tuning. Dirac reduces room-induced resonances and improves imaging by correcting both time and frequency response. This optimisation brings greater clarity, depth, and focus, allowing your speakers to perform at their best.
Dealers selling NAD near you
Authorized dealers for NAD C 658
- Holt Hill — online and in-store — Andover, Massachusetts, United States (website)
- Resolution A/V — in-store — New York City, New York, United States (website)
- The Music Room — online and in-store — Erie, Colorado, United States (website)
- Aalen Hifi — in-store — Schwäbisch Gmünd, Baden-Wurtemberg, Germany (website)
- Absolute Audio - Canada — in-store — Calgary, Alberta, Canada (website)
- Abt Electronics — online and in-store — Glenview, Illinois, United States (website)
- Acoustic Technologies — online and in-store — Montréal, Québec, Canada (website)
- AES — in-store — Mitte, Hessen, Germany (website)
- Ahead Stereo — in-store — Los Angeles, California, United States (website)
- Alex Audio Video — in-store — Sofia, Sofia City Province, Bulgaria (website)
and 279 more verified dealers
NAD C 658 — Feature-packed BluOS streaming DAC with Dirac
The NAD C 658 puts an unusually complete streaming, DAC and preamp stack into one chassis, led by Dirac Live room correction and NAD's BluOS ecosystem. Reviewers such as Piero Gabucci and Marc Rushton note its musical, transparent presentation with articulate midrange, tight bass and clear treble. Its imaging and dynamics make for a wide, well‑defined soundstage, especially after Dirac tuning (see Gordon Brockhouse). Physically the unit is solid and rack‑friendly, with balanced XLR outputs, MM phono, two‑way aptX HD Bluetooth, MQA and MDC expansion. Ideal as the heart of a two‑channel or active‑speaker system, the C 658 delivers rare feature density and performance at its price.
Pros
- Exceptionally comprehensive feature set and connectivity — BluOS streaming, MQA support, two‑way aptX HD Bluetooth, MDC expansion bays, balanced outputs, subwoofer outs and MM phono make the C 658 a flexible hub for modern systems.
- Musical, transparent sonic presentation with strong midrange detail, controlled bass and lively treble; listeners report engaging dynamics and natural timing.
- Dirac Live room correction meaningfully improves bass definition, imaging and perceived spaciousness, turning the C 658 into a powerful room‑tuning front end.
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Cons
- Exterior styling and front‑panel display feel utilitarian and underwhelming for the asking price.
- Built‑in phono stage is competent but described as 'good rather than great', and a few reviewers note Dirac setup can be fiddly; there are also isolated reports of network/standby and headphone/Dirac behaviour quirks.
Sound Quality
90/100
Dynamics
90/100
Reviewers praise the C 658's punch, rhythmic drive and transient clarity (StereoNET: 'punchy and crisp', SoundStage Solo: 'dynamics ... excellent', What Hi-Fi: 'plenty of energy'). While this is a preamp/streamer rather than a power amp, listeners report strong dynamic expression and convincing impact, especially when paired with capable downstream amplification.
Soundstage Imaging
90/100
Most reviews cite a wide, deep and well-defined soundstage with good image specificity and cohesion (SoundStage Solo: 'wide, deep soundstage' and 'instruments more precisely positioned'; StereoNET: 'wide with a fine sense of depth'; What Hi-Fi: Dirac 'opening out the sound'). Dirac Live is frequently noted to significantly expand spatiality and instrument separation.
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Build Quality
86/100
Build and internal implementation are generally praised (StereoNET, SoundStage Solo: 'well-built and finished'), and the unit is substantial at ~10kg. A few reviewers point out the exterior styling and plastic-feeling controls aren’t quite class-leading for the price (What Hi‑Fi: 'doesn’t exactly look the part'), so finish and aesthetics hold it back slightly from a top score.
Features Connectivity
94/100
The C 658 is richly equipped: BluOS network streaming (Ethernet/Wi‑Fi), two-way aptX HD Bluetooth, ESS Sabre 32-bit DAC, Dirac Live room correction, MM phono, headphone amp, balanced/unbalanced outputs (XLR/RCA), multiple optical/coaxial inputs, USB and subwoofer output, plus expansion bays. Reviews emphasize its completeness as a hub and the inclusion of Dirac as a standout feature, justifying a top-tier features score.
Value for Money
93/100
Multiple reviewers call the C 658 a strong value for its feature set and sound (What Hi‑Fi: 'one of the most fully furnished... at this sub-£2000 price', StereoNET: 'hard to beat at this price', HomeTheaterHifi: 'incomparable when you consider the features'). The consensus is that it offers a compelling combination of functionality and performance for its market segment.
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