Below is a review of the T7900 which I've copied to provide info on the system setup. For Surround Sound to work properly,Computer Sound Cards and Home Theater receivers will have speaker outputs for front, rear, side, subwoofer speakers.
"This is a set of 7.1 speakers designed to be connected to your PC's
sound card. 7.1 means that you get 7 speakers with the .1 referring to the sub woofer which generates the bass. The sub woofer is the large box that connects to the mains and is designed to be kept out of sight under your desk. The speakers are relative small which allows you to have three on your desk and the other four discretely placed around the room. Finding some where to put the side speakers can be a pain though however you don't have to use them all. The unit has a switch on the back which allows you to either use 5, 6 or 7 speakers - this is useful as gives more flexibility dependant on the shape of you room. The number of speakers does mean running lots of cables around the room and this is the main disadvantage. Although the cables are fairly thin and can be tacked to the wall (I have hidden them under the carpet though). The unit connects to the three outputs on your sound card. The leads are colour coded but its worth sticking labels on them
to correspond to the connectors on the sound card as if you ever unplug them it can be a pain to get them back in the right order. The sound quality is excellent especially in a smaller room - the bass in particular can be very powerful (this can be controlled via the wired remote). It works better for games than movies though but overall you are unlikely to get better sound quality for the money. Highly recommend."