I'm a little worried about your question about using an adapter to plug your system into an amp. Computer speakers are shielded, meaning the magnetic fields they produce don't make it out of the box, or at least not in a way that would mess with your system. If you plug a tower's speaker output into, say, a stereo system that's nearby, you need to make sure you have some distance between the tower and monitor and the other components, or you run the risk of screwing up your monitor, hard drive, ram, motherboard, power supply, and possibly your immortal soul. Standard speakers from a stereo or whatever are usually not shielded, and meant to be used away from computers.