GaN-based Class D power amps

"Today we show the prototype Lyngdorf 8 x 400 Watt class D amplifier based a new patented class D amplification technology which is the brainwork of my co-founders of Purifi Audio, Bruno Putzeys and Lars Risbo. This is the first of any class of audio amplifier which is completely indifferent to frequency, level and impedance variations. The actual performance is difficult to measure due to limitations to even the best test equipment (AP555). But we are specifying max 0,00015% THD+Noise, at ANY frequency 20-20KHz at 100 W/4 ohms. Intermodulation distortion WAY below any other technology. Notice the output impedance - scaled in micro Ohm!," Peter Lyngdorf

The output section of the MXA-8400 is a completely new electrical Lyngdorf Audio design based on the optimal use of NFB in audio amplifiers. NFB is an arrangement in which an amplifier is made to respond to a fraction of its own output signal in opposite phase in addition to the normal input signal. It effectively reduces distortion and increases linearity.”