About sound drivers

i.) Sound drivers are not the drivers who drive vehicles I am talking about the drivers which are present in earphones.
ii.) Here is the link to the image about the location of the driver in earphones: Click here
iii.) There are different types of drivers like 5 mm driver, 6 mm driver, 7 mm driver, etc.
iv.) The driver which is more mm is more good like a 7 mm driver is better than a 6 mm driver so the sound quality and base will be better for a 7 mm driver than a 6 mm driver.
v.) You may also have heard about dual or about four drivers. The four drivers are present in the speakers because their base and quality combine and mismatch which forms more good sound. It is used by music industries so they can check and find mistakes in sound. We don't need this because we do not check the sound.
vi.) Here is the link to the image of the sound driver: Click here

Of how much drivers you should buy headphones or earphones?

i.) If you want headphones for gaming. There are two types of headphones in ear and on ear. In in-ear headphones will get the noise of the background and in on-ear headphones, you will get very little background noise. On-ear headphones are heavier because their drivers are big. So you should buy on-ear headphones for gaming.
ii.) If you want to listen music so you should buy earphones because their drivers are very small means they are of very less mm.
iii.) If you want to buy a speaker then it should be of 1 or 2 drivers.

For more information check out this video: https://youtu.be/MZNVMoNkvxo