Offering Amazing Control and Transparency
Connect to the emotion of live performance through detailed sound with amazing control and transparency. This is the NAD M22 Masters Series stereo amplifier.
It is easy to find amplifiers that can excel in one or two areas, but the M22 is truly an amplifier that does everything well. Wide open-loop bandwidth, extremely low-phase shift, almost non-existent noise, harmonic and intermodulation distortion independent of load (load invariant), high current capability, and low output impedance (high damping factor) uniformly at all audible frequencies. It all adds up to incredible performance. You just have to hear it to feel it and believe it.
The M22 uses 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.
This is added to UcD’s already amazing characteristics of load invariance and high current capability, common characteristics of great-sounding amplifiers.
Employing the latest generation of digital PowerDrive™ technology, the M22 offers a minimum of 250 watts per channel with amazing reserves of dynamic power at lower impedances. The M22 is capable of more than 300 watts of dynamic power per channel even in 8 ohms, and over 600 watts 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 clipping power over a sustained loading. 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, and there are no capacitors in the forward signal path. Yet, it has a beneficial 12dB/octave roll-off below 2 Hz.
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, but not too tight, custom switch mode design. 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.