How can a single speaker, such as earphones, produce highs and lows at the same time
In: Technology
A sound wave has a single pressure value at any given point in time, so a single speaker can reproduce almost any sound wave by moving in complex ways. After all, a microphone or eardrum is picking up sound the same way- one pressure level at any given instant. The pressure can change like a sine wave which is a single frequency. Or it can be complex and contain many frequencies. For instance, a [square wave contains many odd harmonics](https://en.wikipedia.org/wiki/Square_wave#/media/File:Spectrum_square_oscillation.jpg) of the fundamental frequency.
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