One of the first amps to use Purifi’s Eigentakt self-clocking technology

NAD’s top-of-the-line electronics range has gained a multi-channel power amplifier. The M28 has been designed for both hi-fi and home theater use, delivering 200 watts from each of its seven channels.

The M28 utilises the Eigentakt (meaning “self-clocking”) amplifier technology that it licenses from Danish brand Purifi and which is also found in NAD’s M33 BluOS streaming amplifier. A “further refinement” of the self-oscillating Class D technology used in previous NAD HybridDigital designs, the technology works to improve the performance of Class D amplification by essentially taking into account previously unknown effects of the output filter in the feedback loop and making the amplifier’s response indifferent to speaker load and volume level. 
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https://www.whathifi.com/news/nad-expands-master-series-with-seven-channel-m28-power-amp