[Edit from 3 years later]: Nowadays I wouldn't really recommend doing this. Not that I ever had a problem with it and the sound was still pretty good (lucky me I guess) , but simply put it's not surround sound except by the technical fact that all it is is a bunch of speakers SURROUNDING you. Which for me all I had was the left and right rigged where correct sound would be output on the correct sides. There was no sub or back speakers.
^ Read ABOVE first. ^
It is always best to watch movies or play the very popular game Guitar Hero with a sweet Surround Sound setup. This instructable will show you how to set up and add multiple speakers to your surround sound. You can probably add as many speakers as you like... you should know when your going overboard with all the speakers. Please keep in mind that this is my first instructable.
Step 1: Supplies
Normally you can find all you need for this instructable at garage sales or for pretty cheap used.
*Home Theater Receiver( I got mine free from my uncle; I'm sure if you buy brand new it would be quite expensive.)
*Speakers of any kind(I use just a bunch of speakers I collected for this...all different kinds...most are old)
Step 2: Wiring the speakers together
In my plug picture I am only using half the wires...the wires I am using are the two side sets. What I did is I run one side set of wires around one half of my room then when i get to a point where I want to wire in a speaker i strip the wires at that point. No I don't mean at the end of the wire. Once it is stripped at that point on the set you connect one end of a set going to the speakers to one wire and the other end to the other wire. The pictures might show how better than I can describe it I am noticing, Heh. Any ways keep doing that for as many speakers as you want to add.