7 interesting facts about sound

1. Sound with frequencies of less than 20 Hz is known as infrasound. If a sound has a frequency that exceeds 22,000 Hz it is called ultrasound.
2. Sound is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas.
3. For humans, hearing is normally limited to frequencies between about 12 Hz and 20,000 Hz (20 kHz), although these limits are not definite. The upper limit generally decreases with age.
4. The speed of sound is approximately 343 m/s (1,230 km/h; 767 mph).
5. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves.
6. The accepted units for sound pressure are metric, Newton per one square meter (N/m2).
7. Sound waves are invisible because the human eye can’t see pressure waves. But an oscilloscope can detect and show the shape of sound waves very accurately.

The first commandment   of live mixing “Thou cannot equalise time with amplitude”.   As punishment thou shall be plagued with microphone feedback problems.   Trying to compensate for bad acoustics and poor fidelity speaker systems with equalization is as silly as a dog chasing its tail.
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