What contributes most to a change in how an amplifier sounds?

IMHO amplifier is more important than speakers and sources. 

Reminds me a bit of the old story where organs of the body are having a fight over who was most important.  Can’t remember what the plot twist was — something like the little toe saving the day.

But the moral was the organs make up a team, all of which is “most important” depending on what is going on.

@davetheoilguy    when you go into cardiac arrest, I think the answer to the above will be clearer.

@immatthewj 

When you die a horrible painful death from liver cancer, screaming for relief to come, think the answer to the above will be clearer.

Seriously, what a horrid thing to say.  Grow up and get a life.

All the organs were deciding who should be the boss....

"I should be in charge," said the brain , "I run all the body's systems, without me nothing would happen."

"I should be in charge," said the heart , "I circulate oxygen and nutrients all over."

"No! I should be in charge," said the stomach, "I process the food that gives us energy."

"I should be in charge," said the legs, "without me the body couldn't go anywhere."

"I should be in charge," said the eyes, "I allow the body to see where it goes."

"I should be in charge," said the asshole, "I am responsible for waste removal."

All of the other body parts laughed at the asshole and insulted him. So he shut down. Within a few days, the brain had a terrible headache, the stomach was bloated, the legs got wobbly, the eyes got watery, and the heart pumped toxic blood. They all decided that the asshole should be the boss.

What is the moral of the story? Even though everybody else does all of the work some asshole is usually in charge.