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M28

The Masters M28 uses Eigentakt™ amplifier technology, manufactured by NAD in license from Purifi. This new technology, which NAD was the first to embrace for the M33 Masters Series Streaming Amplifier, adds another level of precision by taking into account previously unknown effects of the output filter in the feedback loop and further refinement of the self-oscillating Class D technology as used by previous NAD Hybrid Digital designs. The result is a performance level that approaches the theoretical limit in measured performance, be it at whispering levels or at full power.

In common with the previous generations of NAD Hybrid Digital technology but unlike most class D amplifier designs, the M28 is impervious to the loudspeaker load it is presented with, maintaining the same wide and even bandwidth response irrespective of the speaker’s impedance and at the same time providing high current capability. The continuous 200W into 8 ohms on tap for all channels driven at the same time and 700W dynamic power into 4 ohms is testament to this.

Inherent to the Eigentakt™ technology is its very analogue-like behaviour in the unlikely event the amplifier is driven into clipping. Whereas many class D designs can become unstable, Eigentakt™ behaves in a way similar to the benign way of clipping with instant recovery of well executed traditional class A/B amplifiers.

The sonic character of the M28 only reinforces the story told by the numbers. This is an amazingly powerful and transparent amplifier bringing new levels of refinement and dynamics at any level.

SPECIFICATIONS

FTC power, two channels	≥ 220 W (ref. rated THD, 8 Ohms , 20 Hz – 20 kHz, two channels driven) ≥ 400 W (ref. rated THD, 4 Ohms , 20 Hz – 20 kHz, two channels driven)
Rated power, all channels	≥ 200 W (ref. rated THD, 8 Ohms , 20 Hz – 20 kHz, all channels driven) ≥ 340 W (ref. rated THD, 4 Ohms , 20 Hz – 20 kHz, all channels driven)
Rated THD (250 mW to rated power, CCIF IMD, DIM 100)	≤0.003 % (ref. 20 Hz – 20 kHz)
IHF dynamic power	280 W 8 Ohms, (all channels driven) 560 W 4 Ohms, (one channel driven)
Damping factor	1.3 V (ref. rated power)
Input impedance Input Impedance (r and c)	47 kΩ (Balanced) 23 kΩ (Single-ended)
Damping Factor	>750dB (ref. 8 Ohms, 50Hz and 1kHz)
Frequency Response	±0.1dB (ref. 20Hz-20kHz)
Input Impedance	47 kilohm (Balanced)
Signal noise ratio	> 102dB (A-weighted ref. 1W, Balanced) > 97 dB (A-weighted ref. 1W, Single-ended) > 124 dB (A-weighted ref. rated power, Balanced) > 120 dB (A-weighted ref. rated power, Single-ended)
Frequency response	± 0.1 dB (ref. 20 Hz – 20 kHz) – 3 dB at 3 Hz to 60 kHz
Time to go to Standby mode at no input signal	≤ 30 minutes
Standby power	≤ 0.5W
Gross dimensions WxHxD	435 x 156 x 380 mm (17 3/16 x 6 3/16 x 15”)
Shipping Weight	21.2 kg (46.7 lbs)

NAD

NAD M28