Moving matter.

Woven cloth dome · Center of the cone

This dome travels with the cone. It covers the opening above the voice coil and keeps grit out of the narrow gap below.

Flexible rubber roll · Between the cone edge and the basket rim

The outer lip stays on the basket. The curved roll flexes with the cone and helps draw it back toward its resting position.

Paper diaphragm · From the coil former to the surround

The narrow end of this cone bonds to the voice coil former. The broad face follows the coil in and out, moving the air in front of it.

Copper winding on a polyimide former · Around the center pole, inside the air gap

Copper wire wraps a thin tube called the former. Current in the winding interacts with the magnetic field, driving the former and cone in and out.

Corrugated fabric suspension · Between the coil former and the basket shelf

These fabric folds flex as the coil moves. Together with the surround, the spider keeps the coil centered and draws it back toward rest.

Cast aluminum frame · Around the cone and above the motor

The outer rim anchors the surround. A shelf deeper inside anchors the spider, holding both suspensions in line with the motor.

Terminal pair and flexible tinsel leads · From the terminal tab to the moving cone

Two flexible leads carry current between the fixed terminals and the winding. Their curved spans flex as the ends attached to the cone move.

Machined steel ring · On the front face of the ferrite ring

The inner edge of this steel ring faces the center pole across a narrow air gap. The voice coil moves through the magnetic field concentrated there.

Permanent ferrite ring · Between the front and back plates

This fixed ring supplies the magnetic field. The steel plates on either face guide that field into the narrow gap around the voice coil.

Steel yoke · Behind the front plate, with the pole rising through its center

The center pole rises from the steel back plate into the coil. Its outer face forms the inner wall of the air gap.