The diaphragms's position relative to the rest of the speaker - highlighted in red.
This thin semi-rigid piece of plastic or cardboard that we all recognize as the face of a speaker is attached to the voice coil and is pushed back and forth by the opposing magnetic fields of the voice coil and permanent magnetthousands of times per second, compressing and rarefying air particles, producing sound.Â
How stiff, dampening, and heavy a diaphragm is can play a large role in the accuracy of the sound waves produced by the speaker. The more rigidity and less mass, the better, however this can become difficult to perfect as adding more rigidity will inherently also add more mass. A good diaphragm should also dampen itself well, meaning it will resonate less, as resonance can sour the sound.