What is special about 440 Hz?

A440 (also known as Stuttgart pitch) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A4 in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16.

How many Hertz is a 440?

Frequencies for equal-tempered scale, A4 = 440 Hz

What kind of audio amplifier is a la4440?

This circuit uses an LA4440 and some supporting components to give you much more power, while retaining a small package that you can use. The IC is a dual channel audio power amplifier, with low distortion, and a good frequency range.

What’s the hidden power of 440 Hz music?

440 Hz Music –– The Hidden Power of Universal Vibration and Frequency. Most of the music around the world has been tuned to 440 hertz since ISO or International Standards Organization endorsed it in 1953.

When did the 440 Hz pitch standard become standard?

The American music industry reached an informal standard of 440 Hz in 1926, and some began using it in instrument manufacturing. In 1936 the American Standards Association recommended that the A above middle C be tuned to 440 Hz. This standard was taken up by the International Organization for Standardization in 1955…

What’s the frequency of an A440 concert pitch?

Modern practices. A440 is widely used as concert pitch in the United Kingdom and the United States. In continental Europe the frequency of A 4 commonly varies between 440 Hz and 444 Hz.