Learning how to be good at production
A theory lesson
Sound is vibrations in gas, solid and liquid.
When you break the sound barrier, it’s called a sonic boom
The time for sound to travel a distance is measured in feet.
Sound Frequency: hurtz
People can hear frequencies from 20 Hz to 20,000 Hz (Measuring from low to high)
1,000 Hz = 1KHz
Decibel is a measure of change, not a measure of sound.
SPL: Sound Pressure Level
Sound Pressure level measures amplitude/loudness
Remember that how loud the music is, is called loudness. It’s also called level when you talk about operating machinery. Contrary to popular belief, it’s not called volume because that’s about measuring in 3 dimensions. Even when it says volume, it’s wrong.
Lowest sound pressure level: 0dB (Mosquito flying ¾ from your head)
Highest sound pressure level: 194 dB (The air cannot handle any more than that.)
85 dB: When the sound level is above 85dB for an average of 8 hours, it will damage your hearing. For every 0.3dB added, the time gets halfed. Your employer must give you hearing protection. Even if it makes the sound level quieter by 15 dB, it will help a lot.
8.8dB; 4 hours
9.1dB: 2 hours
9.4dB: 1 hour
9.7 dB: 30 minutes
100dB: 15 minutes, etc.
180 is when your hearing tissue dies.
Threshold of discomfort: 112dB – 120dBsp power of 2
“ “ pain: 130 – 135 dBsp power of 2
Remember that audiences have no rights to have hearing protection.
What is a sound system?
Remember Loudness=Level, so when someone asks you to change the sound level, you know what to do!
What is a sound operator?
Finally the teen frequency. It’s 17Hz and only young people can hear it. I can hear it! Unfortunately it’s used to scare hoodies out of shops.