![]() ![]() The goal as always is to push the limits of measured performance at all volume levels from the most subtle ambience to the loudest peaks while maintaining stability into any speaker load. It’s a logical continuation and refinement of the Class D hybrid digital technology seen in previous NAD products. It and the M33 streaming amplifier are the first Masters Series components to use Eigentakt modules designed by Purifi Audio in Denmark and manufactured by NAD. The M28 represents NAD’s latest foray into the state of the art in Class D amplifier technology. I reviewed previous versions of this excellent pre/pro in 20. It’s a perfect match for their surround processor, the M17 V2i. Let’s take a look.įor this review, NAD sent me just the M28 power amp. The NAD Masters M28 Seven-Channel Power Amplifier is the latest in a series of Class D amps that have graced my home theater and it might just be the best one yet. Like any new audio technology, Class D has gone through many stages of refinement, and today, it can honestly be said that its sound quality is very close to being equal to the best versions of other topologies. No giant power supplies or massive heat sinks are required. The promise of Class D is great – lots of clean power, low distortion, and little waste heat. ![]() They are considered as Hybrid Class D, but the amplification stage is still analog. ![]() It is an analog process, but there are some new Class D amplifiers that have digital inputs. Class D amplifiers use a single analog switching frequency, between about 350 kHz to 1.2 MHz, to reproduce the musical waveform by turning on and off for varying lengths of time, called Pulse Width Modulation (PWM). NAD has created many high-quality Class AB amps in the past, but their recent focus has been on Class D. ![]()
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January 2023
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