Am I simply amplifying the signal or is a receiver required to bring the sound from the laptop?
Ha, ha, it is actually doing a little of both. If you really wanted too (bad idea) you could just get an amplifier. If you did this you would need to rely completely on the computer for volume control and other adjustments. Since amplifiers are at a fixed output (high level) any possible noise from the computer, such as startup pops, will be fully amplified and very loud. Plus, separate amplifiers are more expensive than receivers in most all cases.
A receiver will allow you to control the volume from it as well as the computer. It will also allow switching between other potential components such as a TV, CD player, game console, or DVD player.
In order to connect the computer to the receiver you will need a 1/8" plug to RCA stereo adapter. One end looks like a headphone cord and the other end will have red and white RCA jacks to connect the receiver.
So the receiver powers the speakers, as they don't have built in amplification, and controls the volume and what component is selected. If you have ever used a boom box or one of those mini-systems with the Radio, CD player, and tape deck all combined into one it has an receiver inside of it, generally speaking. The major components of a sound system are its source (Radio, CD player, DVD player, Computer), the preamp (part of the receiver that controls volume, adjustments, and switching), an amplifier (amplifies the signal for use with speakers), and of course the speakers.
Good luck, I hope I didn't make you more confused.
