The woofer is normally the largest driver in a speaker cabinet and it is designed to produce the low frequencies, like those associated with a bass or drum for music or thunder and explosions in home theater. A midrange looks just like the woofer but is typically smaller. The midrange band of frequencies produces the sounds to which the human ear is particularly sensitive, like vocals in music and dialog in home theater.
THE WOOFER AND MIDRANGE HAVE VIRTUALLY IDENTICAL COMPONENTS, HERE ARE THE KEY PARTS.
Magnet: The donut shaped magnet surrounds the pole piece to create a magnetic field.
Voice Coil: The voice coil is made of two parts: The cylinder or former, which fits over the pole piece, and the copper wire wound around it. It is the driving element of a dynamic driver. Electrical current through the wire creates a magnetic field that interacts with the fixed field of the magnet, causing the voice coil assembly to move.
Pole Piece: Part of the magnet assembly, the voice coil fits over the pole piece.
Spider: A ridged, material suspension that holds the voice coil in place and provided alinear motion.
Cone: The conical shaped diaphragm that physically moves the air to produce sound. It is suspended at its periphery by a surround and at its neck by a spider.
Surround: The compliant suspension at the outer edge of a cone that permits it to move.
Basket: The framework of a dynamic driver