Audio Engineering

736 Chapter 25

Acoustic damping materials Voice coil (on cylindrical former)

Magnet and pole pieces

S

S

N

N

Diaphragm

Motion

Wires to voice coil

Audio input

S

S

N

N

Figure 25.3 : Typical moving-coil headphone transducer. The current through the voice coil

creates a force on the diaphragm, which vibrates it in sympathy with the audio input.

Figure 25.4 : Cut-away view of a Sennheiser headphone earpiece showing the diaphragm,

magnets, and acoustic damping materials.