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NAD M66
The Masters M66 BluOS Streaming DAC-Preamplifier is a revolutionary hi-fi component that combines an audiophile-grade DAC with a high-resolution multi-room music streamer. Featuring Dirac Live Room Correction and Dirac Live Bass Control, its elegant design and vibrant 7″ touchscreen exudes quality and class. Pair it with NAD’s M23 power amplifier for a stunning system that excels technologically, sonically, and visually.
NAD Masters M66 BluOS Streaming DAC-Preamplifier
Not only is the Masters M66 BluOS streaming DAC-preamplifier the most advanced preamplifier NAD has ever offered, it represents an entirely new class of hi-fi separate components. In addition to a plethora of inputs, including MM/MC phono and HDMI eARC, the M66 incorporates an audiophile-grade DAC and a high-resolution multi-room music streamer.
Along with the full-bandwidth version of Dirac Live Room Correction, the M66 features Dirac Live Bass Control, allowing independent control of each connected subwoofer, for smooth, consistent response throughout your listening room. The combination of Dirac Live Room Correction and Dirac Live Bass Control enables the M66 to deliver more accurate in-room performance than any two-channel component ever offered.
With its elegant aluminum casework, super-smooth digital volume control, and vibrant 7″ touchscreen, the M66 exudes class and quality. Visually, sonically, and technologically, it’s an ideal match to NAD’s award-winning Masters M23 power amplifier. Of course, the Masters M66 BluOS Streaming DAC-Preamplifier can be paired with any high-performance amplifier.
Music Everywhere
Featuring a high-resolution network streamer based on the acclaimed BluOS multi-room music-management system, the M66 provides access to more than 20 streaming services, including several that offer lossless and high-resolution audio. Using the intuitive BluOS app on a smart device or personal computer, listeners can play music from their favourite streaming service, their personal music libraries, and thousands of Internet radio stations, in resolution up to 24-bit/192kHz. Like all BluOS-enabled components, the M66 has full MQA decoding and rendering capability.
With BluOS, you can listen to music in just one room; or share music over your home network with up to 63 additional BluOS-enabled components from NAD and other hardware partners. The M66 integrates easily with home-control systems from Control4, Crestron, ELAN, RTI, URC, and others. Listeners can also control playback by voice using Amazon Alexa or Apple Siri.
Perfect Response
The M66 integrates Dirac Live Room Correction and Dirac Live Bass Control. Connect the supplied calibrated microphone to the M66’s USB port and then launch the Dirac Live app on a smart device or personal computer. The app will walk you through the calibration process, and then generate correction filters that compensate for acoustic problems like standing waves and unwanted reflections. You’ll enjoy more textured bass, improved tonal accuracy, vastly improved clarity, and more focused imaging.
In a first for a stereo component, the M66 features four balanced and four single-ended subwoofer outputs and integrates Dirac Live Bass Control, which allows independent calibration of multiple subwoofers. Dirac Live Bass Control optimizes subwoofer output in both the frequency and time domains, achieving a seamless blend between the subwoofer(s) and main speakers, and delivering smooth, consistent bass response through the entire listening area, not just in the sweet spot.
Peak Performance
At the heart of the M66’s digital section are ESS Technology’s flagship Sabre DAC and ADC chips. These audiophile-grade designs are known for their exceptionally wide dynamic range, ultra-low noise and distortion, and outstanding time-domain performance.
The M66 is the first component to feature NAD’s innovative Dynamic Digital Headroom (DDH) circuitry. When activated in the BluOS app, DDH eliminates digital inter-sample peak clipping distortion, which can occur during digital-to-analogue conversion with sudden high-frequency transients. The benefits are especially noticeable with percussion instruments: rim shots are more impactful but less strident; cymbals are more realistic and less splashy.
For volume adjustment, the M66 employs an ultra-precise resistor-ladder control circuit. Compared to traditional analogue circuits, the M66’s digital volume control markedly reduces thermal and related distortions, maximises dynamic range, and more accurately matches left- and right-channel output across the entire volume range.
By default, analogue signals are converted to digital so that functions like Dirac Live Room Correction and Bass Control are available with all sources. However, the M66 has a selectable Analogue Direct mode that bypasses all digital processing, and separate signal paths for analogue and digital sources. Internally, the analogue and digital sections are physically separated and shielded from each other with their own separate power supplies sections, so that analogue signals are unaffected by digital interference when Analogue Direct mode is engaged. This results in distinct volume attenuation, superb left and right tracking and very low noise.
Connect Everything
With its full suite of analogue and digital inputs, the M66 can accommodate all your source components. Vinyl fans will appreciate the M66’s ultra-quiet MM/MC phono stage, which features precise RIAA equalization, high overload margins, and an innovative circuit that suppresses the infrasonic noise that is always present with vinyl playback without affecting bass response. For TV and movie viewing, there’s an HDMI eARC port for connection to an HDTV. Other options include two coaxial and two optical S/PDIF inputs, an AES/EBU balanced digital input, two pairs of RCA line-level analogue inputs, and one pair of XLR balanced inputs.
In addition to unbalanced RCA and balanced XLR outputs for connection to a power amplifier, the M66 has four unbalanced RCA and four balanced XLR subwoofer outputs. The M66’s dedicated headphone amplifier has very low output impedance and very high maximum output voltage, enabling it to drive demanding high-impedance studio monitor headphones. The M66 also has Bluetooth connectivity, with support for the AAC, LDAC, and aptX HD codecs.
Future Forward
The Masters M66 represents the pinnacle of what is technically achievable in a two-channel preamplifier today, and will maintain its technological leadership for decades to come. On the rear panel are two expansion slots that support MDC2, the latest generation of NAD’s Modular Design Construction future-proofing technology. As technology evolves, this will enable M66 owners to add new capabilities simply by inserting an MDC2 module into one of the slots.
Everything about the NAD Masters M66 BluOS streaming DAC-preamp is intended to inspire pride of ownership: the gorgeous 7″ touchscreen, the elegant aluminium casework, and the silky-smooth digital volume control. With its leading-edge technology, unmatched versatility, and superb build quality, the Masters M66 is truly a masterpiece of sound.
Features & Details*
• Ethernet and Wi-Fi networking
• BluOS network streamer provides access to over 20 streaming services, including several that deliver lossless and high-resolution audio
• Flagship ESS Sabre ES9038PRO DAC and ES9822PRO ADC chips
• Innovative Dynamic Digital Headroom (DDH) circuit eliminates digital intersample peak clipping distortion
• Full MQA hardware decoding and rendering
• Support for Apple AirPlay 2, Spotify Connect, Tidal Connect
• Seamless integration with smarthome control systems such as Crestron, Control4, ELAN, RTI, URC, Josh.ai and others
• Support for Amazon Alexa and Apple Siri voice control
• Dirac Live Room Correction
• Four balanced and four unbalanced subwoofer outputs
• Dirac Live Bass Control enables seamless blend between the subwoofer(s) and main speakers, and smooth bass response throughout the listening area
• Ultra-quiet MM/MC phono stage with precise RIAA equalization, high overload margins, and infrasonic filter
• HDMI port with eARC support
• Two optical and two coaxial S/PDIF inputs, one AES/EBU balanced digital input, two pairs of RCA line-level analogue inputs, one pair of XLR balanced inputs
• Dedicated headphone amplifier with low output impedance and very high output voltage capability
• Ultra-precise resistor-ladder digital volume control
• 7″ front-panel touchscreen
• Elegant aluminium casework
• Two MDC2 expansion slots for adding future capabilities
• Premium IR remote control included
*all features and details listed are preliminary
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NAD M66 — Masters‑class streaming preamp with pro‑grade sub control
Built around an ESS ES9038PRO DAC and BluOS streaming, the NAD M66 marries reference‑class decoding with a uniquely capable room‑correction toolkit. Its standout is Dirac Live Bass Control for up to four subwoofers, a feature reviewers from HiFi News and Roger Kanno credit with transforming bass integration and soundstage. Sonically the M66 is neutral, low‑noise and dynamically assured — praised by Mike Prager and Barry Jones — and it offers an analogue‑direct path and a high‑quality MM/MC phono stage for purists. Masters‑series build, a 7" touchscreen, stepped‑resistor volume and MDC2 expansion make it a flexible one‑box solution for listeners who want to consolidate streamer, DAC, phono and advanced multi‑sub bass management into a single, high‑performance unit.
Pros
- Industry‑leading multi‑sub integration: Dirac Live Bass Control lets you calibrate and time‑align up to four subwoofers for much smoother, better‑integrated bass and a larger, more coherent soundstage.
- Neutral, transparent and dynamically capable presentation with a very low noise floor—excellent detail retrieval in both digital and analogue‑direct modes.
- Comprehensive feature set and connectivity—BluOS streaming, Roon Ready, HDMI eARC, phono MM/MC, balanced XLR/AES, touchscreen control and MDC2 expansion make the M66 a long‑term system hub.
- High‑quality analogue path and headphone output with an Analogue Direct bypass for those who want a pure analogue chain without DSP.
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Cons
- Dirac Bass Control delivers great results but requires a paid licence and careful setup; the multi‑sub workflow can be complex for casual users.
- Missing home‑theater bypass and some reviewers noted interface/firmware quirks (and a reported wake‑from‑standby gain issue), so expect occasional setup friction.
Transparency
96/100
Multiple reviewers praised an exceptionally low noise floor and 'black background'—HomeTheaterHifi called it 'reference-level' and noted 'black backgrounds and inner details', SoundStage Solo said it was 'surgically clean', and SoundStage/Solo editors described the sound as 'neutral and transparent'. Analogue-direct/analog-bypass modes and high measured SNR support the reviewers' impressions of an extremely unobtrusive signal path.
Sound Quality
92/100
Dynamics
92/100
NAD's Dynamic Digital Headroom and reviewers' listening notes emphasize improved transient response and punch—HomeTheaterHifi noted 'heft and slam', Future Audiophile highlighted convincing timbral dynamics, and reviewers reported excellent transient response with Dirac engaged.
Soundstage Imaging
91/100
Numerous reviews cite wide, deep soundstages and precise imaging—HomeTheaterHifi and SoundStage reviewers described broad, well-defined staging with good depth and pinpoint imaging. A few minor comments mention slightly diminished height precision on certain tracks, preventing a perfect score.
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Build Quality
92/100
Reviewers praised Masters-series industrial design, robust construction, and thoughtful engineering: relay-switched resistor array/stepped attenuator for volume, high-quality chassis and touchscreen. Several reviews called the M66 'superbly engineered' and 'handsome' which supports a high build-quality rating.
Features Connectivity
94/100
Extremely well featured: BluOS streaming, Dirac Live full-frequency plus Dirac Live Bass Control for up to four subwoofers, balanced XLR AES inputs/outputs, HDMI eARC, MM/MC phono, headphone amp, touchscreen, remote, and analog-direct bypass. The feature set is top-tier for a modern active preamplifier and justifies a near-maximum connectivity score.
Value for Money
93/100
Across multiple reviews the M66 was characterized as an outstanding value for its combination of performance and functionality—phrases used include 'no-brainer', 'something of a bargain', and 'cannot think of another product at a comparable price'. Reviewers who compared it to higher-cost setups found it competitive or superior, supporting a strong value score.
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