Class G allows an amplifier to have temporarily more power on music peaks and remain within weight constraints (more capacitance). Imagine how big and heavy a McIntosh 5 to 7 channel home theater amp would be with 5 to 7 autoformers!
Class G is an amplifier operating system. The output stage it is connected to can be Class A (single device), Class A (multiple devices) or Class AB (multiple devices). Class G switches the rail voltages to the output stage from low voltage to higher voltage for musical peaks where power/watts are needed to avoid clipping distortion.
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