Have you ever been told to turn the volume down on your music? Have you ever wondered why when something is loud it is said to have more volume? In this instructable I hope to clear up some major misconceptions about sound, and hopefully help you understand how sound works.
This instructable is more of a how it works as opposed to a how to. Once you understand how it works, it is much easier to learn the how to.
Please note that I am constructing this from a sound engineer's point of view. Most of the content is theory, so please keep that in mind when you read this.
If you haven't read my first instructable "How Sound Works" yet, I suggest you read it first. You can find it here: http://www.instructables.com/id/How-Sound-Works/
Step 1: What is sound pressure?
Sound Pressure Level is normally abbreviated SPL. SPL is calculated in decibels or db. Please note that db is a relative term. It can refer to almost anything, however, the most well known is SPL. Most of the time when someone is talking about db, they are probably referring to SPL.