NAD M2 Specifications

Pulse Width Correction actively adjusts the pulse width (PCM to PWM conversion) to compensate for amplier
non-linearity.
Power Supply Feedback is a scheme where the power supply voltage is monitored and the amplier gain is adjusted,
compensating for pulse amplitude errors.
Pre-correction is a static compensation for known amplier non-linearities.
Direct Digital Feedback operates simply by determining the pulse area error, no matter what the cause, and passing this
information back to the digital domain where compensation can be made. This method calls for all distortion mechanisms
regardless of their source.
The New Frontier
As proven by our recent Masters Series ampliers (M3, M25), NAD has brought the performance of the Linear Class AB
amplier very close to theoretical perfection. The next frontier for improved performance is the digital amplier.
Now the M2 provides a benchmark for performance, both measured and subjective, in the new world of digital
amplication. Highly efcient, immensely powerful and musically revealing and involving, the M2 Direct Digital Amplier
takes its place among the world’s best ampliers regardless of price or design philosophy.
But for a digital amplier implementing this simple concept is anything but simple! As we have pointed out, the M2 takes
a digital input signal and outputs an analogue signal to drive the loudspeaker.
The conventional feedback architecture with a loop from the output to the amplier’s input is too slow and not a successful
approach with a digital amplier, so the direct digital feedback technology was developed to deliver the solution.
A feedback error signal is generated by comparing an extremely pure PWM reference and then converts to the digital
domain for digital correction. This loop correction, occurring once every 9 trillions of a second, assures the highest levels
of speed and accuracy. This very direct feedback approach is at the heart of the M2 architecture.
Some limited forms of feedback have been used successfully before in PWM-based amps. The common problems
with digital amplication and the various solutions are shown in the table below:

NAD M2 Specifications

General

Amplifier class	-
Frequency range	20 - 20000 Hz
Audio output channels	2.0 channels
Peak power per channel	250 W
Signal-to-Noise Ratio (SNR)	- dB
Total Harmonic Distortion (THD)	0.004 %
AC (power) in	Yes
Purpose	Home
Product color	Silver
Connectivity technology	Wired
AC input voltage	100-240 V
AC input frequency	50 - 60 Hz
Power consumption (standby)	1 W
Package weight	25600 g

Weight and Dimensions

Depth	502 mm
Width	435 mm
Height	148 mm
Weight	20200 g