There are two frequent problems with hi-fi
amplifiers. Class A, the traditional audiophile’s choice, uses a single
power supply constantly running at full capacity, even when there’s no
signal coming through. Great for reproducing those subtle details at low
levels however struggles to provide extreme power when needed.

Class A/B, the most common amp class, switches between the two
internal amplifiers, one for each half of the waveform. Far more
efficient but often a recipe for crossover distortion, since those
low-level details we crave can get lost within any mis-match between the
two switching over.

Class G is essentially a hybrid amplifier, utilising Class A
specifically for low-level signals, but when required switching in an
additional power supply to power those larger sections of the waveform.