The voice coil is the only thing present in the speaker which carries electrical current or signal. It is energised directly from the amplifier. The voice coil, as its name implies, is the part of the speaker that does the talking.
The voice coil, Fig. 4.13, consists of several turns of wire wound on a supporting bobbin. Depending on the functional design of the loudspeaker, the coil itself may be copper or aluminium wire, although insulated aluminium ribbon is also used. In case of the latter, the ribbon is wound on edge with the flat surfaces of neighbouring turns adjacent to each other and all the turns held together by a binding cement.
Fig. 4.13 The voice coil
The bobbin, or the voice coil former upon which the wire is ...