How can a single speaker, such as earphones, produce highs and lows at the same time
In: Technology
[This figure should help explain it.](http://proaudioencyclopedia.com/wp-content/uploads/2015/07/Figure-1-5.png)
A shows 4 waves each with different frequencies and C shows what you get when you combine those waves together. (Ignore B and D). A combination of different sound waves creates a single wave with a unique pattern. So instead of a speaker moving in and out by same amount (wave amplitude) at a steady rate (wave frequency) it does a mixture of varying amplitude and frequency to create one sound wave that sounds like what you get when you combine lots of different sounds.
Copy pasted this from last time I answered a similar question – [https://www.reddit.com/r/explainlikeimfive/comments/c7lm6z/eli5_how_are_we_able_to_hear_multiple_frequencies/](https://www.reddit.com/r/explainlikeimfive/comments/c7lm6z/eli5_how_are_we_able_to_hear_multiple_frequencies/)
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