After many years of research for the best amplification, Class G (Class G/H) seemed to be the most appropriate in terms of high power with low dissipation.
Class G/H uses multiple power supply rails of various voltages, seamlessly switching to a higher voltage when the audio signal requires it and seamlessly switching back to lower supply voltage when the audio signal reduces.
The average power consumption and heat caused by wasted power is therefore reduced. Classes G/H amlifiers require considerably more complex power supplies but combine many advantages.
Note that PSI Audio has also designed class G/H amplifiers for several other industries when these couldn’t achieve the desired specifications with class D or class A/B amplifiers.