How can a single speaker, such as earphones, produce highs and lows at the same time
In: Technology
Different sizes of speakers are ‘specialized’ for different frequencies. That does not mean that a single speaker can not output a broad band of frequencies.
Every tone, every sound is a combination af various different frequencies, and the sum of those is a weird mess of a signal, and it works the other way round, every messy signak is just the sum of several sine waves with different amplitudes and frequencies (search for Fournier Transform).
Practically any speaker can turn every signal into sound, but depending on size, mass and corpus some frequencies are amplified better (search for resonance), multi speaker designs are therefore capable of better sound quality. To smoothen the loudness of a single speaker electronic low or high passes are set, adjusting those is what you do on an equalizer. If you had no electronics adjusted for the speaker size you would hear the resonant frequencies very loud and others barely.
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