The NAD M2 Direct Digital Amplifier represents a new level of amplifier performance. Combining the ultra low distortion and noise levels of the finest linear Class A and Class AB amplifiers with the efficiency and streamlined signal path of the digital amplifier, the M2 is the first implementation of a new amplifier technology called Direct Digital Feedback. Co-developed with UK based Diodes Zetex Semiconductor, and using a unique implementation of their patented DDFA architecture, the M2 redefines what is possible with digital amplifier technology.
Because the M2 Direct Digital Amplifier can accept a digital PCM input directly, the noise and distortion added by cascaded analogue amplifying stages, as found in traditional Class AB or even Class D amplifiers, is completely eliminated. This streamlining of the system architecture can reduce the residual noise of the overall system by a factor of three.
For Direct Digital Feedback to work correctly requires a very wide bit path and very high speed operation. The M2’s extremely wide 35-bit data path allows for compensation to be made without truncating any information in the original signal. Running from a master clock frequency of 108MHz there is enough speed to keep a very wide amplifier bandwidth and very low noise and distortion in the audio band.
A DSP is custom programmed with NAD’s own high resolution digital volume control with an astounding 120dB attenuation range and perfect channel balance. A five position digital impedance compensation filter allows fine tuning of the top octave to match the chosen speaker impedance that will result in perfectly flat frequency response at 20kHz. Because there are still analogue sources, and because some users will want to use a traditional analogue preamplifier with the M2, we have provided a stateof- the-art Analogue-to-Digital converter stage. This fully balanced stage accepts both a Single Ended input and a Balanced XLR input. Both the analogue input buffer amp and the ADC are of the highest quality available today.
The Digital Porcessor Loop: this unique feature allows the advanced user to insert external digital fi lters into the signal path. Using the Optical TosLink format allows fuss-free connection to Macs and PCs where there is a wide library of crossover filters and room correction programs available. Digital outputs in both coaxial and optical formats make it possible to use multiple M2s for bi or triamplification of advanced loudspeaker systems.
The M2 uses three power supplies, all of them highly efficient switch mode types. Each channel gets its own high current power supply in a dual mono configuration. The Input stage and control sections get their own dedicated supply with multiple regulated secondary voltages for individual sections. Digital PowerDrive™ optimizes the M2’s performance when driving real loudspeakers by maintaining optimum power delivery and lowest possible distortion. Unlike most digital amplifiers that do not have power reserves, the M2 has excellent dynamic power capabilities. Mai multe informatii.
NAD M2 Direct Digital Amplifier Features: - Direct Digital Amplifier - 2 X 250W Continuous Power at 8 and 4 Ohms - > 500W IHF Dynamic Power - < 0.004% THD 20Hz – 20kHz from 500mW to 250W - > 120dB Dynamic Range - 40uV Residual Noise - > 2000 Damping Factor at 50Hz +0/-0.5dB Frequency Response 20Hz – 20kHz, -3dB >85kHz - Channel Separation >90dB @ 1kHz, 80dB @ 10kHz - Digital PowerDrive - Digital Soft Clipping (switchable) - 5 Position Digital Impedance Compensation Filter Analogue-to-Digital Conversion: - A/D Conversion for Analogue Inputs - Multi-bit Delta/Sigma 24/216kHz - 0.0004% THD - Sample rate 32kHz - 192kHz - 124dB S/N Ratio - High Resolution 120dB Digital Attenuator - Inputs Digital SPDIF: AES/EBU, Coaxial X 2, Optical X 2 - Inputs Analogue: Balanced, Single Ended - Processor Loop: SPDIF Optical (Mac PC compatible) out/in - 2 Sets of Speaker Binding Posts to facilitate Bi-wiring - Remote Control - RS-232 serial data port - IR Input - 12V Trigger Input and Output - <1W Standby Consumption - 90% Amplifier Efficiency
