Wrong question. It is related to results but does nor answer your question.
Operating class is not a value graduation, while applicable to RF amps not so directly with audio. All low level stages are operating in class A, i.e. full current, they only need to amplify voltage with no demamds for power. Only the output stage adds current to the formula. Here the biasing class determines the zero signal current of the output stage. Biasing needs to overcome device non-linearities at lower idle current. More current is more heat and power wasted, less for output. Heat loads increase adding demands for heat sinks and bigger power supplies.
So there are tradeoffs. 5W class A or 15W class AB? Class D is not a biasing class, just a diffent amp architecture. Output stage is like switch mode powersupply, either fully on or off. The magic happens at the input where the switching levels are determined. Anything other than pure DC in the power supply will end up in the output just like any other amp class.
Focusing on bias class is a waste of time. Find a good pairing with your speaker is more important. Difficult speakers will reduce the choice of amplifiers. Shun those 85dB speakers.
Good dynamics means high efficiency with budget in mind.
Operating class is not a value graduation, while applicable to RF amps not so directly with audio. All low level stages are operating in class A, i.e. full current, they only need to amplify voltage with no demamds for power. Only the output stage adds current to the formula. Here the biasing class determines the zero signal current of the output stage. Biasing needs to overcome device non-linearities at lower idle current. More current is more heat and power wasted, less for output. Heat loads increase adding demands for heat sinks and bigger power supplies.
So there are tradeoffs. 5W class A or 15W class AB? Class D is not a biasing class, just a diffent amp architecture. Output stage is like switch mode powersupply, either fully on or off. The magic happens at the input where the switching levels are determined. Anything other than pure DC in the power supply will end up in the output just like any other amp class.
Focusing on bias class is a waste of time. Find a good pairing with your speaker is more important. Difficult speakers will reduce the choice of amplifiers. Shun those 85dB speakers.
Good dynamics means high efficiency with budget in mind.