NAD Masters Series M66 Stereo preamplifier with HDMI, built-in BluOS™ streaming, Apple AirPlay® 2, and Bluetooth®

The M66 is NAD's top-tier Masters Series stereo preamp, with audiophile-grade components and build-quality alongside bountiful connections and a full-color touchscreen. This beast of a preamp is designed to squeeze maximum sound quality out of your connected sources, including a turntable, disc player, and even a TV. There are also lots of built-in streaming options, including BluOS for high-res multi-room streaming capability. If you want a highly versatile foundation for a high-performance audio system, this outstanding preamp is worthy of serious consideration.

Bountiful connections

The beautifully designed M66 preamp provides rich, detailed sound for your digital and analog sources.

With versatile inputs and outputs, the M66 can be the nerve center of a magnificent hi-fi system. There are balanced XLR and single-ended RCA outputs to make the connection to your favorite power amp — the M23 power amplifier would be a perfect match.

There are also balanced XLR and unbalanced RCA inputs for connecting sources, plus separate phono inputs for both moving magnet and moving coil cartridges. Coaxial and optical digital inputs let you connect compatible digital sources. An AES/EBU XLR digital input lets you add a high-performance CD or network transport. And it also has an HDMI eARC port for connecting a TV, so your system can pull double duty for music and movies.

Flexible streaming options

When you connect the M66 to your Wi-Fi network, you'll get powerful system control and high-res streaming capability via the free BluOS Controller app. It also offers multi-room syncing with other BluOS speakers and components. I have three BluOS players in my home and love how it gives me easy access to my streaming sources and digital library. I also love its stable settings and great sound.

BluOS provides support for Spotify Connect, TIDAL Connect, and many more popular streaming services (may require subscription). Apple® AirPlay® 2 lets you stream directly from an iPhone® or iPad®. It also works with Roon (subscription required).

Advanced room correction

The M66 includes Dirac Live — one of the industry's best room-correction platforms. This software-based system uses the included calibration microphone to take precise acoustic measurements of your room. Then it creates a customized correction curve that fine-tunes the output of your speakers and subwoofers. You get balanced, clear sound that's uniquely tailored to your space.

Multiple subwoofer outputs with Dirac bass control

The M66 offers an impressive — and unprecedented — four balanced and four unbalanced subwoofer outputs. It also has Dirac Live Bass Control calibration that helps you dial in the smooth, evenly balanced bass response from your connected subwoofers.

Exceptional sound technology

The M66's high-performance ESS Sabre DAC (digital-to-analog converter) chip provides a wide dynamic range with ultra-low noise and distortion and minimal timing errors (jitter) that can smear musical detail.

And the M66 is the first NAD component with Dynamic Digital Headroom (DDH) circuitry, which you can activate in the BluOS app. DDH gets rid of digital inter-sample peak-clipping distortion that can mar sudden high-frequency transients — like cymbal crashes and snare rim-shots — during the digital-to-analog conversion process.

The ultra-precise, resistor-ladder volume control circuit reduces distortion, maximizes dynamic range, and helps keep left- and right-channel output accurately balanced across the entire volume range. And a selectable Analogue Direct mode lets you bypass all digital processing to prevent digital interference. You can even disable the M66's Wi-Fi and Bluetooth circuits in the BluOS app to prevent RF interference and get the clearest possible analog sound.

Ready for the next thing

The M66 also features NAD's MDC2 architecture, with two expansion slots for adding yet-to-be-invented technology that can broaden this preamp's capabilities.