I say that because you're collecting a large sum of equipment that would otherwise be in someone's garage collecting dust, attic collecting more dust, or on the curb/in dumpster.
You claim to have several hundred feet of wires all of your floor, let's hope that doesn't cause you to trip/fall and hurt yourself.
In your last post you mention you just "bought" a new receiver which is 2.1 and has two speakers and a 4" subwoofer with it.
Let me clarify a few things in regard to these pieces of equipment.
A 4" driver in virtually any orientation can't render output low enough or in high enough output to be considered a "subwoofer" in the definition of the word. At best I would call this a bass module since it is meant to complement small satellite speakers with low frequencies they are otherwise unable to output due to their size and output limitations.
Your Panasonic isn't really a subwoofer either, but I'm sure the manufacturer calls it that. Technically any subwoofer that doesn't extend to subsonic frequencies (20 Hz and below) is not a subwoofer but is rather a low frequency output device, bass module, etc...
A basic stereo receiver is 3 basic components combined into one unit; amplifier, preamplifier, and a tuner. The tuner receives radio frequencies in FM bands and typically AM bands as well, which is where they derive the name "receiver". The preamplifier controls the output level at a line output level (low voltage, low amperage to feed a higher gain input on a power amplifier for final output to speakers). It also controls input selection as well as tonal controls. The power amplifier's task is solely to drive speakers, it's level is controled by the preamplifier section. A home theater receiver adds a 4th part, a processor, which I will include digital to analog conversions as well as raw decoding and algorithm processing (such as DTS and Dolby Digital decoding from a DVD player which is a digital signal of bits and bytes).
For someone in your position of bargain hunting you should consider looking into different avenues as I get the feeling your current ones are limited to computer speakers, home theater in a box systems, and shelf systems.
Garage sales commonly have old to vintage audio equipment that is cheap and effective. I have bought countless cheap audio components from garage sales, pawn shops, thrift shops (less common that you'll find much that's good in a thrift shop, but you can still score big in those places), and I also like to see what's going on craigslist. I don't know if you travel often to Detroit, but that town is full of pawn shops (convincing your parents to take you could be difficult). Personally I would avoid dealing with people on craigslist in Detroit, stick to Windsor if you can, although it seems fairly inactive.
Because you're 15 your transportation is probably limited, as well as your accessibility to any reasonable funds to go out looking for audio equipment. However, if you save what little you get eventually you'll be able to get something you want instead of some second rate toys. When I was 11 or 12 I was like you, I had taken speakers out of toys, little motors, and tinkered around with everything. Toward the beginning of my audio ventures I received that Panasonic stereo I mentioned near the beginning of the thread. By the time I was 14-15 I had that Denon integrated amplifier (a receiver minus the tuner) and a pair of Jensen C-JR bookshelf speakers. Those little speakers were pretty cheap, however they sounded far better than what came with the panasonic system, and they were a lot smaller too. I didn't really need a subwoofer at the time and I got by fine with their bass output which was reasonable. I paid $20 for the amp and $40 for the speakers when they were on sale. I used a boombox I had as the source by using the headphone output as a line level out, then shortly after a portable CD player that actually had a dedicated output.
Used CD players are a dime a dozen, however you have a computer (something I certainly did not have when I was your age) so you'll probably be fine listening to most or all of your music while using that as your source. A CD player is nice because it doesn't include a fan noise, and lots of light.
I had realized that picking up every junk little speaker and internally amplified setup was not ever going to help me. As a kid I had to fight the temptation to buy petty little powered speakers at garage sales. I know how it feels, but if you don't stop yourself know, who knows where you'll be by the time your my age? Probably under a pile of junk that you collected during that time. I know this can happen easily and without yourself even noticing, my dad and aunt are perfect examples.
