.

Keeping this in view, what causes the amplification of sound?

Essentially, the stapes acts as a piston, creating waves in the inner-ear fluid to represent the air-pressure fluctuations of the sound wave. The ossicles amplify the force from the eardrum in two ways. The main amplification comes from the size difference between the eardrum and the stirrup.

why does a cup amplify sound? As the string slides through your fingers it begins to vibrate. The string causes the paper clip to vibrate the bottom of the cup. As the bottom of the cup vibrates, waves of compressed air (sound waves) are created. The shape of the cup concentrates and amplifies the sound waves.

Besides, how does an amplifier make sound louder?

They collect sound energy over a large area and funnel it into a much smaller area, so making it sound louder—that's simple, mechanical amplification.

Do amplifiers sound different?

They are a very real (and clearly measurable) impact on the sound we hear. So yes, all amplifiers do sound the same if subjected to proper controlled double blind testing and no amount of hyperbole, wishful thinking, audio quackery, pseudoscience or indeed money is going to make it not true.