Stereo Power Amplifier
Connect to the emotion of live performance through detailed sound, with both amazing control and transparency. While it is easy to find amplifiers that can excel in one or two areas, the M22 is an amplifier that truly does everything well. Wide open-loop bandwidth, extremely low-phase shift, almost non-existent noise, and high current capability all add up to one incredible performance. Wielding NAD’s PowerDrive™ circuit topology, the M22 delivers unbelievable power to any loudspeaker. Distortion and noise become functionally nonexistent and nearly unmeasureable thanks to the M22’s switch mode design, resulting in a clear, amazing sound. Possessing harmonic and intermodulation distortion independent of load, as well as low output impedance uniformly at all audible frequencies, the M22 is a powerhouse unit built to break down barriers to audiophile-grade sound.
Hybrid Digital Power for massive analogue emotion.
Hybrid Digital Amplification
The M22 is using the latest nCore™ amplifier technology licensed from Hypex to provide a nearly ideal amplifier with distortion below measurement, ultra-high damping factor, and unconditional stability with any speaker. Tight, detailed sound with amazing control and transparency gets the best performance available. With nCore, Hypex has refined their UcD concept to new levels of perfection by improving the modulator for more accurate feedback subtraction and PWM generation. The all-discrete driver and output stage have also been improved for lower open-loop THD as well as lower idling losses, normally conflicting requirements with conventional IC driver circuitry. An added control loop incorporating an integrator with adaptive clipping enables 20dB more feedback to be used across the audio band because of its extremely low-phase shift resulting in a dramatic reduction in distortion across the audio band.
The M22 employs the latest generation of digital PowerDrive™, which offers a minimum of 250W per channel with amazing reserves of dynamic power at lower impedances. It is capable of beyond 300W dynamic power per channel even in 8 Ohms, and beyond 600W in 2 Ohms. It can effortlessly power any loudspeaker to live performance levels with amazing efficiency and low power consumption. Control for PowerDrive is derived by sensing the average output power, applying a time constant, and then cleanly hard clipping the signal thus limiting it to the rated continuous power over a sustained load.By controlling the power envelope maximum clean power is obtained for every operating condition.
The output stage is only one of several circuits in the amplifier, and each must complement the other to obtain optimal performance. The amp is DC coupled throughout, from input to output, there is no capacitor in the forward signal path. Yet, it has a beneficial 12dB/octave roll-off below 2Hz. It does this using a unique circuit topology that is functionally a forward servo. It is however not a servo in the traditional sense as it does not measure DC at the output and send back a correction signal. Instead part of the input signal is fed to a side chain with a second order low-pass filter. The output of this is subtracted from the forward signal input to the second stage thus rejecting DC.
Clean and Dynamic
The performance of the entire signal path is critically dependent on the power supply; in this case a well-regulated, custom switch mode design is utilized. This allows maximum dynamic power, very high current yet with very low distortion. Secondary supplies are individually regulated and decoupled at each opamp for lowest possible noise and maximum dynamic range.
Line In, Speaker Out
• Continuous output power into 8 Ohms and 4 Ohms (Stereo) >250W (at rated THD, 20Hz-20kHz, both channels driven)
THD+N 20Hz-20kHz, CCIF IMD, SMPTE IMD, DIM 100 <0.003% (250mW to rated power, 8 Ohms and 4 Ohms)
Clipping Power (8 Ohms) >300W (at 1kHz 0.1% THD)
IHF Dynamic Power 8 Ohms 355W
4 Ohms 640W
2 Ohms 620W
Peak Output Current >50A (ref. 1 Ohm, 1ms)
Signal/Noise Ratio, A-weighted, ref. 1W >98dB
A-weighted, ref. rated power >120dB
Damping Factor >800 (ref. 8 Ohms, 50Hz and 1kHz)
Frequency Response 3Hz-30kHz (ref. -3dB)
Input Impedance RCA 17 kilohm + 200pF
XLR 200 kilohm + 100pF
Input Sensitivity 1.6V (ref. rated power)
Voltage Gain 29dB
Minimum Input Level for Auto Trigger 10mV at 1kHz
Standby Power <0.5W
Idle Power 40W
Unit Dimension (WxHxD) – Gross* 435 x 103 x 379mm, 17 1/8 x 4 1/16 x 14 15/16 inches
Net weight 8.9kg (19.6lb)
Shipping Weight 15kg (33.1lb)