why did the speaker suggest the banging of the drum and the singing of the song to be louder
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Answer:
Loudspeakers will play loud when the cone vibrates a large amount, or soft when it moves a small amount. Why? Think about drums. Banging a drum skin really hard makes the skin vibrate a greater distance and produce a louder sound. In the same way, sending a bigger pulse of electricity into a loudspeaker makes the cone move further and generates a louder noise. Quieter sounds are made by smaller pulses of electricity.
We can reach the same conclusion by thinking about energy. The laws of physics tell us that we can't make energy out of thin air. So if we want to make a loud sound (one that carries lots of energy), we need to create a vibration with lots of energy in the first place (in other words, hit something really hard).
Some drums have pedals on them that make the skin tighter or looser. If the skin is tight, it vibrates more quickly when you bang the drum and produces a higher-pitched sound; if the skin is loose, the opposite happens and you get a much lower note. A similar thing happens in a loudspeaker. Bigger speakers with large cones (known as woofers) move more slowly than smaller speakers with smaller cones (known as tweeters)—so they are better for producing lower frequencies. Any speaker can produce a wide range of different sound frequencies by moving back and forth quickly (for higher notes) or slowly (for lower notes).
Speakers that need to produce high-frequency sounds (or ultrasound, well beyond the range of human hearing) sometimes use piezoelectric transducers, based on vibrating crystals, instead of the traditional magnetic coil setup. Often referred to as crystal loudspeakers or just "buzzers," they're also used to produce piercing sounds in things like telephone ringers and smoke alarms, where the effectiveness of the alert is much more important than its quality.
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