What is the audible frequency in engineering?

I thought the normal audio frequency was 20 to 20,000 Hz.

I heard that engineering uses it differently.

And why do you write it so differently?

548 2016-05-15 Gentleman

As you know, the audible frequency of a person is about 20 to 20000 Hz.
But as you get older, the audio frequency decreases.
So when you make earphones, you have to consider it so that everyone can hear it.
So I'm setting the audio frequency a little bit narrower in engineering.
The reference bandwidth is 300 to 3400 Hz.

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