voice coil
coil of electrical wire attached to the apex of a loudspeaker cone or dome, produces magnetic field due to the electrical sound signal which interacts with permanent magnet and makes the diaphragm vibrate and produce sound
en-GB/ˈvɔɪs ˈkɔɪl/
en-US/ˈvɔɪs ˈkɔɪl/