NAD Masters Series

M23
Stereo Power Amplifier

Building on NAD’s long tradition of identifying and developing cutting-edge amplification technology, the M23 HybridDigital Stereo Power Amplifier features Purifi Audio’s Eigentakt™ design, a once-in-a-decade innovation that virtually eliminates harmonic and intermodulation distortion. Noise is inaudible, for a completely black background and exquisite micro-detail. Conservatively rated at 2x200W continuous into 8 ohms and 2x380W into 4 ohms, the M23 can deliver live performance levels through any loudspeaker. With its unique combination of features, performance, and value, the M23 represents the new benchmark for the stereo power amplifier.

NAD Masters M23 Stereo Power Amplifier
Pure Power

The M23 employs Eigentakt™ class-D amplifier modules manufactured by NAD under license from Denmark’s Purifi Audio. Purifi’s load-invariant design provides wide, flat frequency response, even into challenging loudspeaker loads. Noise, harmonic distortion, and IM distortion are virtually unmeasurable at all frequencies and output levels. Another benefit of the Eigentakt™ design is extremely low output impedance and correspondingly high damping factor, for iron-clad control of the loudspeaker output. NAD combines the Eigentakt™ design with our own sophisticated switched-mode power supply, which can provide additional reserves of current when needed. Amazingly powerful and transparent, the M23 can deliver 2x260W of peak power into 8 ohms and 2x520W into 4 ohms.

Uncompromised Performance

The ideal amplifier will achieve vanishingly low distortion, ultra-high damping factor, and rock-solid stability with any loudspeaker loud. There are many amplifiers that perform well in one or two of these areas, but fall short in others. Thanks to Purifi’s highly efficient Eigentakt™ design and NAD’s proven switch-mode power supplies, the M23 excels in all three areas – without the excess weight and cost of the old-fashioned linear power supplies and class-AB output stages used with traditional amplifiers. Eigentakt™ outperforms previous class-D implementations by a significant margin, delivering transparent, detailed sound with expansive soundstaging and holographic imaging, at all listening levels and with all types of program material – even during complex musical passages.

Flexible and Powerful

Equipped with single-ended RCA and balanced XLR auto-sensing inputs, three-position gain-control switch, and 12V trigger input, the NAD Masters M23 HybridDgital Stereo Power Amplifier can easily be integrated into a high-performance separates system. Two M23 amplifiers operating in bridged mode can be paired together, each delivering 700W of continuous power into 8 ohms. The M23 amplifier can also be paired with NAD’s award-winning Masters M33 BluOS Streaming Amplifier. With the two Eigentakt™ amplifiers operating in bridged mode, the M33/M23 combination will deliver a staggeringly powerful 700Wpc continuous output.

Elegant and Practical

With its elegant all-alloy casework, the Masters M23 HybridDigital Stereo Power Amplifier is as pleasing to the eye as it is thrilling to the ears. The M23 has the same quality of construction for which NAD’s Masters Series is renowned. Rigid panels and magnetic iso-point feet provide a rock-solid foundation for the M23’s multi-layer circuit boards and intricate internal construction. Truly the M23 represents a new pinnacle in power amplifier design.

Features & Details

• HybridDigital Purifi Eigentakt™ amplifier technology
• Continuous Power Output: 2x200W into 8 ohms; 2x380W into 4 ohms
• Dynamic Power Output: 2x260W into 8 ohms; 2x520W into 4 ohms
• Bridged Power Output: 700W mono continuous into 8 ohms
• In bridged mode, can be combined with the NAD M33 BluOS Streaming Amplifier to create a 2x700W system
• Virtually unmeasurable noise, harmonic distortion, intermodulation distortion
• Wide, flat frequency response into any loudspeaker load
• Balanced (XLR) and single-ended (RCA) auto-sensing inputs
• Three-position adjustable gain control
• 12V trigger input

SPECIFICATIONS

ANALOG AUDIO INPUT/SPEAKER OUT

• Input impedance (R and C)
• Single-ended: 56 kohms + 200 pF Balanced: 56 kohms +200 pF
• Frequency response (1W into 8 Ohms)
• ±0.06dB (20-20kHz)
• Rated output power into 8 Ohms and 4 ohms(Stereo mode) 80 W (ref. 20 Hz-20 kHz at rated THD, both channels driven)
• >200W into 8 Ohm, >380W into 4 Ohm
• Rated output power into 8 Ohms (Bridge mode, ref. 20 Hz-20 kHz at rated THD, both channels driven)
• >700W into 8 Ohm
• THD (20 Hz – 20 kHz)
• <0.00069% (XLR), <0.0013% (RCA)
• Signal-to-Noise Ratio
• >101.7 dB (1W into 8 Ohm)
• >127 dB (200W into 8 Ohm)
• Clipping power (Stereo mode, at 1 kHz 0.1 % THD)
• >210 W (0.1 % THD 1 kHz 8 ohms)
• Clipping power (Bridge mode, at 1 kHz 0.1 % THD)
• > 770W
• IHF dynamic power (Stereo mode, at 1 kHz)
• 8 ohms: 260 W
• 4 ohms: 520 W
• IHF dynamic power (Bridge mode, at 1 kHz)
• 1017W
• Peak output current
• >25 A (in 1 ohm, 1 ms)
• Damping factor
• >800 (ref. 8 ohms, 20 Hz to 6.5 kHz)
• Frequency response
• ±0.06 dB (stereo), ±0.054 dB (bridged) 20 Hz -20 kHz -3 dB at 60 kHz
• Channel separation
• High gain RCA: >97dB, Low gain XLR: >115dB (1kHz)
• High gain RCA: >75dB, Low gain XLR: >96dB (10kHz)
• Stereo Mode input sensitivity (for 200 W in 8 ohms)
• Low gain: 4.5V (low gain), 2.5V (Mid gain), 1.4V (High gain)
• Stereo Mode Gain
• 19dB (low), 23.9dB (mid), 29.2 (high)
• Bridge Mode Gain
• 25.1dB (low), 30dB (mid), 35.2 (high)
• Standby Power
• <0.5W

DIMENSIONS AND WEIGHT

• Dimensions (W x H x D)*
• 435 x 133 x 381 mm (17 1/8 x 5 1/4 x 15 “)
• Net Weight
• 9.7 kgs / 21.4 lbs
• Shipping Weight
• 17.5 kgs / 38.5 lbs
• Shipping Size W x H x D
• 569 x 258 x 519 mm (22 13/32 x 20 7/16 x 10 5/32 ”)

M28
Seven Channel Power Amplifier

Completely immerse yourself in the moment with Purifi™.

Purifi Eigentakt Amplification

The Masters M28 uses Eigentakt™ amplifier technology, manufactured by NAD in license from Purifi. This new technology, which NAD was the first to embrace for the M33 Masters Series Streaming Amplifier, adds another level of precision by taking into account previously unknown effects of the output filter in the feedback loop and further refinement of the self-oscillating Class D technology as used by previous NAD Hybrid Digital designs. The result is a performance level that approaches the theoretical limit in measured performance, be it at whispering levels or at full power.

In common with the previous generations of NAD Hybrid Digital technology but unlike most class D amplifier designs, the M28 is impervious to the loudspeaker load it is presented with, maintaining the same wide and even bandwidth response irrespective of the speaker’s impedance and at the same time providing high current capability. The continuous 200W into 8 ohms on tap for all channels driven at the same time and 700W dynamic power into 4 ohms is testament to this.

Inherent to the Eigentakt™ technology is its very analogue-like behaviour in the unlikely event the amplifier is driven into clipping. Whereas many class D designs can become unstable, Eigentakt™ behaves in a way similar to the benign way of clipping with instant recovery of well executed traditional class A/B amplifiers.

The sonic character of the M28 only reinforces the story told by the numbers. This is an amazingly powerful and transparent amplifier bringing new levels of refinement and dynamics at any level.

Fully Balanced Audio

The same efficient audio interface used by studios provides the highest level of signal integrity with the lowest noise floor.

Locking connectors and special interface electronics allow long cable runs without noise pickup or signal loss. All you get is awesome sound without the possibility of noise pickup or interference.

Effortless Power

As our most powerful amplifier ever, the M28 can pump out over 700W into difficult loads to follow complex dynamic peaks in your movies and music. Everything from rim shots to asteroid explosions sound remarkably real and immersive.

The M28 has power reserves to meet the demands of the latest high-resolution digital soundtracks. Thanks to the advanced Purifi Eigentakt™ amplifier technology, all this monster power comes at a lot less cost than traditional technology and delivers more power and performance!

SPECIFICATIONS

OVERALL SPECIFICATIONS

• FTC power, two channels
• ≥ 220 W (ref. rated THD, 8 Ohms , 20 Hz – 20 kHz, two channels driven)
  ≥ 400 W (ref. rated THD, 4 Ohms , 20 Hz – 20 kHz, two channels driven)
• Rated power, all channels
• ≥ 200 W (ref. rated THD, 8 Ohms , 20 Hz – 20 kHz, all channels driven)
  ≥ 340 W (ref. rated THD, 4 Ohms , 20 Hz – 20 kHz, all channels driven)
• Rated THD (250 mW to rated power, CCIF IMD, DIM 100)
• ≤0.003 % (ref. 20 Hz – 20 kHz)
• IHF dynamic power
• 280 W 8 Ohms, (all channels driven)
  560 W 4 Ohms, (one channel driven)
• Damping factor
• 1.3 V (ref. rated power)
• Input impedance
  Input Impedance (r and c)
• 47 kΩ (Balanced)
  23 kΩ (Single-ended)
• >118dB (ref. rated power)
• Damping Factor
• >750dB (ref. 8 Ohms, 50Hz and 1kHz)
• Frequency Response
• ±0.1dB (ref. 20Hz-20kHz)
• -2.5dB at 3Hz and 100kHz
• Input Impedance
• 47 kilohm (Balanced)
• Signal/noise ratio
• > 102dB (A-weighted ref. 1W, Balanced)
  > 97 dB (A-weighted ref. 1W, Single-ended)
  > 124 dB (A-weighted ref. rated power, Balanced)
  > 120 dB (A-weighted ref. rated power, Single-ended)
• Frequency response
• ± 0.1 dB (ref. 20 Hz – 20 kHz)
  – 3 dB at 3 Hz to 60 kHz
• Time to go to Standby mode at no input signal
• ≤ 30 minutes
• Standby power
• ≤ 0.5W

DIMENSIONS AND WEIGHT

• Gross dimensions WxHxD
• 435 x 156 x 380 mm (17 3/16 x 6 3/16 x 15”)
• Shipping Weight
• 21.2 kg (46.7 lbs)

M33
BluOS® Streaming DAC Amplifier

In its simplest form, the M33 BluOS™ enabled DAC/amplifier is an ultra-high-performance streaming amplifier with superb audiophile sound. As a BluOS enabled component, the M33 can be combined with other players in a BluOS ecosystem of wirelessly networked music players throughout the home for an outstanding whole-home audio system. With the employment of the new Purifi Eigentakt™ Hybrid Digital amplifier technology, the M33 follows NAD’s long-standing tradition in identifying and developing cutting-edge amplification technology. With a minimum of 200W per channel on tap, the result is lifelike performance, exemplified by ultra-low distortion and noise.

BluOS High-Res Music Streaming

The Bar has been Raised with the Masters M33 BluOS Streaming DAC Amplifier
Our Flagship Model Builds On Remarkable Success with Advanced Features, Cutting-Edge Technology and High Power

Part of a growing ecosystem of compatible products, BluOS tightly integrates hardware and software for an exceptional user experience. The only true wireless High-Resolution multi-room system available today, BluOS supports the new standard for High Res streaming, Master Quality Authenticated (MQA). BluOS also supports over 20 free and paid subscription services as well as supporting locally stored music libraries. With BluOS, the M33 retains all the audiophile features and further adds a range of facilities that will expand its capabilities yet simplifies ease-of-use at the same time. Operable with the BluOS app, the supplied remote control or through hands-free control with any Amazon Alexa device, the M33’s front panel never needs to be touched.

DIRAC Live Room Correction On Board

Experts agree that room acoustics are the weakest link in most sound systems with room reflections deteriorating tonal balance and dynamics. Dirac, one of the most highly regarded Room Correction systems available, not only adjusts for frequency response, but unlike other room correction systems, it also optimises the impulse response. By optimizing the speaker/room interface, music sounds more natural and lifelike. Supplied with the M33 is a precision microphone to measure the room at and around the listening position so your system can be precisely calibrated for optimum performance. Even the most sophisticated loudspeakers can be markedly improved using Dirac calibration. Each of the 5 Dirac memory slots can store a unique room measurement or different frequency target curves to suit a particular musical taste or genre.

Flexibility Meets Long-Term Value

In its standard form, the M33 is very complete with a wide range of in/outputs, BluOS, Dirac, HDMI and more already fully integrated. It will meet the requirements of the most demanding users. To minimize the risk of future obsolescence, the M33 comes with two MDC (Modular Design Construction) slots that allow for further expansion. NAD introduced the MDC platform well over a decade ago and allowed updating products with new technologies which didn’t even exist at time of introduction

Connection and Wireless Flexibility

Whether looking to connect digital or analogue sources, the M33 comes well equipped to accommodate for all of these: 6 digital inputs and 3 analogue inputs, including MM phono. Around back, the rear panel hosts two sets of speaker outputs capable of bi-wiring and a stereo Subwoofer Output with a fully configurable Digital Crossover. Airplay 2 and Bluetooth AptX-HD allow for local wireless streaming from a phone or tablet.

*Some features will be available via a future software update

Phono and Headphones Are Not Forgotten

The M33 has a high-quality MM Phono Input that rivals specialized outboard units. Accurate RIAA equalization, a clever phase cancelling infrasonic filter, and a huge overload margin combine to bring out the best in LPs. Furthermore, headphone enthusiasts will delight at the sound of the discrete headphone amplifier, which is able to drive even planar and high impedance studio phones. With high voltage and low output impedance, headphones will sound their best. For those who wish to enjoy their headphones but not be tethered to a cable, the integrated Bluetooth AptX-HD module makes it possible to enjoy wireless headphones as well.

Attractive Design With Outstanding Ergonomics

The all alloy casework is elegant yet practical. The single control knob for volume is supplemented by a colour LCD touchscreen display. Rigid panels with magnetic iso-point feet provide a solid foundation for the multi-layer circuit boards and intricate internal construction. The M33 employs a completely modern and fresh take on the traditional stereo amplifier, with features and performance from the future.

Smart Home Integration Made Easy

BluOS provides hands-free control with full integration of any Amazon Alexa device. Through Airplay 2, control is also possible with Siri. Considerable effort has been spent to make the M33 fully compatible with all the leading smart home systems from leading companies like Apple, Crestron, Control4, Lutron, KNX and many others. This means that along with lighting, shades, HVAC, and security, the integrator or user can seamlessly control the BluOS multi-room music system from a common interface. All integrations are certified for reliable operation. The custom BluOS Apps for iOS and Android tablets and phones, as well as desktop control from Windows and Apple OS are available free-of-charge and are updated regularly.

Key Features of the NAD Masters M33:

• • BluOS Streaming DAC Amplifier
  • HybridDigital Purifi Eigentakt™ Amplifier Technology
  • Continuous Power: 200W into 8/4 Ohms
  • 32-BIT/384kHz ESS Sabre DAC
  • Dirac Live Room LE Correction*
  • Colour LCD touch display
  • BluOS multi-room Integration
  • 2 x MDC Slots for Future Expansion
  • Wireless control with AirPlay 2 and aptX HD Bluetooth Integration
  • Comprehensive digital and analog connectivity including HDMI eARC
  • Integrates seamlessly with leading smarthome control systems
  • MDC (Modular Design Construction) offers ability to upgrade to future digital formats as they become available. Two MDC slots provided.
  • CI friendly- RS232 Serial Control Port. Trigger In/Out.
  • IR In with learning function

SPECIFICATIONS

AMPLIFIER SECTION

• • Rated output power (ref. 20 Hz-20 kHz at rated THD, both channels driven)
  • >200 W into 8 ohms >380 W into 4 ohms
  • Rated output power, Bridge mode (ref. 20 Hz – 20 kHz at rated THD)
  • >700 W into 8 ohms
  • Input sensitivity
  • 865 mV (ref. 200W 8 ohms, Volume maximum)
  • THD (20 Hz – 20 kHz)
  • <0.003 % (1W to 200 W, 8 ohms and 4 ohms)
  • Signal-to-Noise ratio
  • >98 dB (A-weighted, ref. 1 W out in 8 ohms)
    >120 dB (A-weighted, ref. 200 W out in 8 ohms)
  • Clipping power
  • >210 W (0.1 % THD 1 kHz 8 ohms)
  • IHF dynamic power
  • 8 ohms: 260 W
    4 ohms: 520 W
  • Peak output current
  • ≥25 A (in 1 ohm, 1 ms)
  • Damping factor
  • >800 (ref. 8 ohms, 20 Hz to 6.5 kHz)
  • Frequency response
  • ±0.2 dB (20 Hz -20 kHz)
    -3 dB at 60 kHz

PREAMPLIFIER SPECIFICATIONS