Sine Wave D 4 - 293.66 Hz for 1 minute - Test Tone

Sine Wave D 4 - 293.66 Hz for 1 minute
D is a musical note a whole tone above C, and is known as Re within the fixed-Do solfege system.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle D (D4) is approximately 293.665 Hz.

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Видео Sine Wave D 4 - 293.66 Hz for 1 minute - Test Tone канала Test Tones