Headphones are created by assembling components like plastic housings, earpads, and headbands, then installing the "driver," which is the heart of the headphone. The driver is a small speaker made of a magnet, a voice coil, and a diaphragm that vibrates to produce sound when an electrical signal passes through it.

These steps detail how a completed headphone set is created:

1. Component creation
   Housings and headbands: These are often made by injection molding plastic into the desired shape. Machines may stamp trademarks onto the casing components.
   Voice coil: Copper wire, sometimes as thin as a human hair, is wound hundreds of times by a computer-controlled machine to create the voice coil.
   Diaphragm: A plastic membrane is shaped using heat and pressure from a press.
   Earpads: These are made from various materials like foam, leather-effect, or artificial leather and are affixed to the ear cups. 
   
   
2. Assembly
   The driver, which includes the voice coil and diaphragm, is placed inside the ear cup housing.
   The earpads are then attached to the cups.
   The headband is attached to connect the two ear cups.
   The leads and connector jack are connected to the driver and housing.
   A small amount of glue and UV light may be used for sealing. 
   
   
3. Testing
   Before final assembly, micro speakers (drivers) undergo testing to ensure they meet frequency range and distortion standards.
   Acoustic testing systems use ear simulators with reference microphones to measure the sound output of the headphones.