OPPO Enco W31 headphones has a 7mm *dynamic driver.

 

 

* A driver is an electromagnetic device that converts electrical signals into audible sound. In simpler words, it creates the sound you hear in the headphones. It is important for any pair of headphones to function. Earphones can have driver sizes ranging from 7-50mm in diameter depending on the headphones sizes. Generally, a driver’s size determines the loudness of the earphone.

 

There are 4 different driver types: dynamic, planar magnetic, electrostatic, and balanced armature drivers.

 

Dynamic drivers are more commonly found in headphones because they are inexpensive technology, compact and lightweight enclosure and excellent bass quality. A dynamic speaker driver unit consists of three main parts namely – a magnet, a voice coil and a diaphragm.