Before we get to the importance of keeping the vents squeaky clean, let’s go through the engineering behind them. Apple’s own patent application for the AirPods filed in 2019 talks about “a rear vent that enable the internal speaker to provide audio performance in the confined space within the earbud housing.” Fun fact: Apple’s patent says that the vent’s acoustic insert is made from “a carbon doped plastic that absorbs laser energy.” It’s unclear what kind of laser energy, exactly.
The vent actually serves as an important air flow channel from the outside. With the main speaker grill tightly sealed from the outside, the vents allow the movement of air in and out of the acoustic chamber. The acoustic chamber is where the driver sits, and it is the part that vibrates to produce the music you hear. Without proper airflow, the driver activity is adversely affected. Plus, they also help avoid the suction after the earbuds get a tight fit inside the ear canal.
If you cover the air vents on your AirPods, the music output will sound different, especially within the low and middle frequencies of sound. Apple’s patent links the vents with changing “the frequency response of ear bud in a way that helps to tune the frequency response and/or provide a consistent bass response.” Panasonic also mentions that the acoustic chamber “optimizes airflow to create a powerful bass and enhances sounds.”
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