The reflective center of each speaker cone does a shiny little dance when music is playing; it's pretty neat.

The voice coil is attached by adhesives to the back of the speaker cone.

If mounted at the speaker cone, the sensor is usually an accelerometer.

But the final step in the process - pushing the speaker cone back and forth - is more difficult.

The output circuit's load (the work it does) is moving the speaker cone.

As you might guess from looking at the size of the speaker cones, there is very little low-end power.

The sound quality from the two one-inch speaker cones will not exactly make you think you're sitting in Carnegie Hall.

The other end connected to a speaker cone.

When the coil moves, it pushes and pulls on the speaker cone.

This uses more amplifier power and may drive the speaker cones into non-linearity.