Frequencies Registry

A440 Pitch Standard Solfeggio Frequencies 432 Hz Alternate Tuning 12-TET Equal Temperament Just Intonation Pythagorean Tuning Human Audible Range Middle C (C4)Octave (2:1)Perfect Fifth (3:2)Shepard Tone Nyquist Frequency Mains Hum Schumann Resonances

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