Your question is very similar to a question my mother asked me and since the answer is the same, allow me to start with a proxy question:
How can a paper speaker reproduce the intricate timbre of such a wide variety of musical instruments? A wood flute sounds different than a metal flute, a steel string guitar different than a nylon string guitar, etc. It seems like the material imparts some unique properties. How does a speaker made out of paper do all that?
The analogy I used was roughly this: Imagine you're trying to hold a door shut while somebody is pushing on the other side of it. If all you can feel is the push on the door, you can't tell if the person is pushing with their bare hards, wearing gloves, or pushing the door with a tuba. The door propagates the push all the same.
Now take the case of a speaker. The thing between your ear and the speaker is is the air. The speaker is pushing on the air and making waves of pressure in the air that reach your ear.
This website has a nice image of this:
Your ear picks up changes in pressure and based on the frequency and amplitude of the pressure changes interprets the vibrations as sound. Every aspect of that sound, its loudness, tone, timbre, everything, are all encoded into a sequence of pressure waves in the air.
The speaker could be made out of pretty much anything including a Tesla coil as long as the speaker can cause changes in air pressure at the right frequencies and amplitudes.
You only need one cone connected to one magnet and vibrated back and forth by an electromagnet to do that. As the cone is pushed back and forth it's pushing on the air and that push makes it to your ear as changing air pressure. A complicated design is not needed for just pushing air.