Magnepan is much better. You should also use it with a single subwoofer.http://dahlquistspeakers.com/
You need a power amp.
The audio comes out of the computer, LINE level.
The line plugs into the input of the power amp.
The power amp powers the right left speakers.
The sub I mentioned has it's own power amp built in.
So, you can use an integrated amp / receiver amp / or just a power amp.
The computer will not power speakers directly, you need an amp between the computer and the speakers.
Magnepans require a pretty good amount of power, so make sure you get an amp with enough output wattage to drive them.