I don’t know if you have noticed that in addition to the sound hole on the earphone, there are often some small holes on the back. Over Ear Active Noise Cancelling Headphones，What are the uses of these small holes?
In fact, these small holes are also called “tuning holes”, and they exist to make music more beautiful. The essence of a headphone is a small sound system placed in your ear, and the current pushes the diaphragm inside the headphone to vibrate and push the airflow to produce sound.
However, if the internal vibration of the earphone drives the air flow, the air pressure inside the earphone will increase due to the flow of air flow, which will increase the resistance of the diaphragm vibration, resulting in the sound of the earphone being stuffy and not transparent enough.
Then, at this time, the tuning hole needs to play a role. Tuning holes allow air to flow freely through the speaker, which not only prevents pressure buildup, but also creates better sound quality and deep bass. The inside of the tuning hole is often pasted with a tuning mesh and a tuning cotton to adjust the sound more precisely.
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Active Noise Cancelling Headphone Noise Cancelling Principle
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