NAD M25 7-Channel Amplifier

amplifier — Fri, 23 Dec 2011 16:06:37 +0000

The NAD M25 7 channel audio amplifier is actually made up of seven individual mono block amplifiers with each channel using a balanced junction FET input stage to eliminate cross-talk, resulting in exceptionally low levels of noise and distortion. Additionally, NAD employs a unique electronic ground isolation circuit to prevent ground loop noise in the system-a common problem with many complex multi-channel systems.

M25 7-Channel Amplifier Features

7 X 160 watts Full Disclosure Power, 20Hz – 20kHz, at less than 0.03THD with all channels driven simultaneously into 8/4 Ohms
Dynamic power of 220 watts at 8 Ohms, 385 watts at 4 Ohms, and 485 watts at 2 Ohms
NAD’s Custom-Made “Holmgren” transformer
Precision low noise Input Level Controls
12V Trigger for advanced control options, 1 in
Detachable AC cord

NAD M25 Specs

Power Amplifier

Continuous power out into 8 ohms 7 x >160 W (22.0 dBW)
Rated distortion (THD 20Hz-20kHz) 0.03%
Clipping power (0.1% THD) >180W
IHF dynamic headroom at 4 ohms 3.9dBW
IHF dynamic power
- 8 ohms >220 W (23.4 dBW)
- 4 ohms >385 W (25.9 dBW)
- 2 ohms >485 W (26.9 dBW)
Damping factor >180 W
Frequency response
- 20Hz-20kHz ±0.2 dB
- 3Hz/70kHz -3dB
Input impedance R and C >1 Mohms;C = 180 pF
Input sensitivity (for rated output into 8 ohms) 1250mV+/-50mV
Voltage gain 29.0dB

Physical Specification

Dimensions (W×H×D)435 x 200 x 465.6mm
Net Weight 43.7 kg
Shipping Weight 51.0 kg

NAD M25 photo gallery

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NAD M2 amplifier

amplifier — Sat, 17 Dec 2011 13:50:03 +0000

The NAD M2 Direct Digital Ampliﬁer represents a new level of ampliﬁer performance by 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.

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.

The NAD M2 amplifier 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.

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

M2 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

NAD M2 amp inputs and outputs

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

M2 Control Options

RS-232 serial data port
IR Input
12V Trigger Input and Output
<1W Standby Consumption
90% Amplifier Efficiency

NAD M2 amplifier photos

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