I’ll give a couple of examples.
The magnets move at a finite speed. So, even though the signal is telling the magnets to move, it takes time for them to actually do so. The slower they move in response to the signal, the messier the final sound is. So, if you use bigger coils of wire or lighter magnets, you can get the magnets to respond faster.
Also, the magnets are attached to cones that actually move the air. These cones need to very stiff so that they don’t distort the sound wave that they’re trying to generate. If you can make a stiffer cone, you can make better sound.
These are just two examples. There a lots of ways to make a speaker better.
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