This is a custom tutorial for making your own RCA (aux cable) to TRS end (the same on on your headphone jack).
Why make this? - you can hook up your mp3 or laptop to your surround sound system.
Okay! so let's get started
Why not just buy it in store? - You are always free to do so, but in some regions it is hard to find stores that will sell these types of things, especially if you live in a less urban area. Some stores also can charge a fairly large amount of money for such an easy project. Plus this is really fun and you can feel proud you did something.