Audiophiles are quick to name the umpteen flavors of Dolby, but at the risk of oversimplifying things a tad, there are just three types of surround sound today — each easily identified by their plug.

Logitech unveiled the Z506 5.1 Surround Sound Speaker System. Giving you the flexibility to set up your system the way you want, Logitech's newest speaker set lets you connect nearly any entertainment ...