Want to know how speakers are made? Speakers were first formulated as early as the 1800's and are still around today. Speakers all come in different forms, sizes, and are manufactured by different companies. Although all speakers may look differently; they are all produced with the same basics.
The first process of making stereo speakers is the electrical anatomy. The electrical anatomy includes a voice coils that are formulated by copper wrapped around a type of plastic called a bobbin. A bobbin is placed on a tender iron core. The bobbin is then connected to a cone on the other end of it. Then, there is the audio amplifiers. The wires from the voice coils connects to the audio amplifier to send vibrations from the coil to the wires. The vibrations produce sound and they are called "soundwaves."
Then, there is the frame of the speakers that protect the coils, bobbin, and iron core. Most speaker covers are made by iron. The iron may be melted, stamped, then dried to produce the small holes that you may see on speaker covers. There is also a large magnet that you may see through the speaker cover and it is called a "permanent magnent." The permanent magnet is usually formulated with pure ceramic and looks almost like circles within circles with the smallest circle protruding out. The magnet is mainly formulated to prevent blowout from extreme soundwaves controlled by volume. Different speakers have different magnet strengths which explains why some speakers may be more valuable than others.
Reference: How Speakers Work