Labtec Arena 515

Labtec Arena 515 ... One of the most compelling features of the Arena 515 is that it provides 4-speaker surround sound with both standard and the new, 4-channel sound cards.

If you have a 4-channel sound card simply connect both the front and rear speaker plugs to the sound card. The result is four discrete channels of sound that improve the total experience of computer audio. If you have a standard sound card (with just one speaker jack) Labtec's exclusive M3D Matrix Surround Sound uses complex mathematical calculations to provide ambient sound at the rear speakers. What you gain is a more realistic, immerse listening experience.