NAD M23 v2

The NAD M23v2 stereo power amplifier features second-generation Purifi Eigentakt modules. This model builds on the brand’s decades of experience in designing high-fidelity amplifiers. It is engineered to deliver transparent sound reproduction and precise dynamic control, in line with NAD’s design philosophy since 1972.

Second-Generation Eigentakt Architecture: Beyond Conventional Class D

At the heart of the M23v2 are second-generation Purifi Eigentakt amplification modules, manufactured under exclusive license by NAD in its own facilities. This technology, whose name literally means “self-timed” in German, addresses the historical challenges of Class D amplification through patented feedback algorithms and a revolutionary circuit topology.

The Eigentakt modules employ a feedback loop with gain exceeding 75 dB across the entire audio band, corresponding to an unprecedented 110 MHz gain-bandwidth product. This architecture achieves virtually immeasurable harmonic and intermodulation distortion at all frequencies and output levels. The patented error correction circuit compensates in real time for non-linearities, including the magnetic hysteresis of the output inductors—a phenomenon often blamed for the harshness of previous-generation Class D amplifiers.

The M23v2’s extraordinarily low output impedance results in a damping factor exceeding 1600 from 20 Hz to 4 kHz at 4 ohms, even reaching nearly 2000 above that range. This ensures absolute control over driver movement, which is especially critical in the bass register where excursions are greatest. The frequency response remains rigorously flat regardless of load impedance, demonstrating the truth of Purifi’s “load-invariant” promise.

Construction and Design: Excellence in Every Detail

The M23v2’s full-alloy chassis reflects the high-end positioning of the Masters series. The thick, rigid panels minimize mechanical resonances, while the integrated magnetic spike feet provide optimal mechanical decoupling. These feet, equipped with removable magnetic pads, allow installation on any surface without compromising vibration isolation.

The internal layout follows a mirrored architecture with complete channel separation, sharing only the power supply. The multilayer PCBs use thick copper traces to minimize parasitic resistance and optimize current transfer. The custom-designed switching power supply by NAD delivers massive instantaneous current reserves while maintaining exemplary regulation. This sophisticated power supply directly contributes to the amplifier’s exceptional dynamic performance: 260 watts per channel into 8 ohms and 520 watts into 4 ohms in dynamic mode.

Ventilation has been carefully considered, with eight vents on the top panel, each protected by a fine metal mesh. Contrary to common beliefs about Class D, the M23v2 does generate some heat that requires proper dissipation, though it is significantly less than that of an equivalent Class AB amplifier.

Connectivity and System Integration: Professional Flexibility

The rear panel of the M23v2 reveals a decidedly professional approach to connectivity. Balanced XLR and unbalanced RCA inputs are equipped with an auto-detection circuit that optimizes gain based on the type of signal received. The three-position gain selector (15.5 dB, 20.5 dB, and 25.5 dB) allows precise adjustment of input sensitivity to match the connected preamplifier.

The new 12V trigger output with a one-second delay is a significant improvement over the first generation. This smart delay prevents simultaneous current surges when powering on multiple chained amplifiers, thus protecting the electrical installation from consumption spikes. The trigger input accepts signals from 3 to 12V, ensuring compatibility with most preamplifiers and processors on the market.

The gold-plated speaker terminals, compatible with banana plugs, spades, and bare wire up to 10 AWG, accommodate a wide range of configurations. Their generous spacing makes it easy to connect thick cables, while their robust construction ensures optimal electrical contact over time.

Synergy with the NAD Masters Ecosystem

The M23v2 finds its natural partner in the M66 BluOS DAC preamplifier, forming a coherent set both technically and aesthetically. The M66 brings Dirac Live and Dirac Live Bass Control room correction technologies, compensating for listening room flaws to reveal the full potential of the M23v2. The M66’s 7-inch touchscreen and BluOS streaming capabilities modernize the user experience while preserving the purity of the analog signal path to the M23v2.

An alternative setup pairs the M23v2 with the M33v2 integrated amplifier, which is also equipped with Eigentakt modules. In this configuration, both the M33v2 and M23v2 operate in bridged mode, creating a 700-watt-per-channel system with integrated streaming. This modular approach allows for progressive system upgrades, a hallmark of NAD’s philosophy since its inception.

Technical Specifications

Amplification Technology and Power

• Amplification technology: HybridDigital Purifi Eigentakt 2nd generation (Class D)
• Continuous output power
  • 200 W per channel at 8 Ω
  • 380 W per channel at 4 Ω
• Dynamic power
  • 260 W per channel at 8 Ω
  • 520 W per channel at 4 Ω
• Bridged mode: 700 W mono continuous at 8 Ω

Audio Performance

• Distortion: virtually non-existent harmonic and intermodulation distortion at all levels
• Noise: inaudible level
• Frequency response: wide, flat, and consistent across all loads
• Output impedance: very low, ensuring perfect speaker control

Connectivity and Controls

• Inputs
  • Unbalanced RCA
  • Balanced XLR with automatic detection
• Gain control: 3-position switch
• 12 V trigger: input and output with 1-second delay to prevent power surges
• Bridged mode function: allows pairing two M23 V2 units for increased power

Integration and Compatibility

• Compatibility: perfectly suited for integration with the BluOS M66 DAC preamplifier and other NAD MASTERS series components
• Applications
  • Demanding audiophile stereo systems
  • Bridged mode installation for maximum power
  • Pairing with NAD M33 V2 for a high-performance streaming system

Design and Construction

• Solid and elegant alloy chassis
• Rigid panels and magnetic feet for optimal isolation
• Multilayer internal circuits for enhanced mechanical and electrical stability
• Premium and robust aesthetics

Key Features

• Clear, precise sound with exceptional stereo imaging
• High continuous and dynamic power for all types of speakers
• Very low distortion and noise
• Excellent stability and control with difficult loads
• Easy and flexible installation with multiple input options
• Modern, efficient, and compact design

Physical Characteristics

• Dimensions (W × H × D): 435 × 133 × 396 mm
• Net weight: 9.7 kg
• Standby power consumption: < 0.5 W