johnnymk

http://www.extremetech.com/article2/...,652870,00.asp
The Z-680s aren't just the Z-560s with an additional speaker and a new box. For its flagship 5.1 offering, Logitech threw the kitchen sink at it, and bulked up with features.

Lots Of Features: These features include a beefed up 450-watt amplifier, a decoder to handle DTS, Dolby Digital and ProLogic II, a line-level input jack for your DiscMan or MP3 player, and a headphone jack for those late-night gaming or movie sessions. Also new is a wireless IR remote that allows the tweaking of center, subwoofer and surround channel volume levels, overall volume level, a mute toggle, an effect selector, an input selector, and a test button that sequentially outputs pink noise through the five satellites to verify correct speaker configuration.

Speaker Cabinets: The Z-680s have a tuned port cabinet enclosure with an 8" driver. What makes this cabinet a little unusual is that the port, rather than being a straight tube, is actually u-shaped. Logitech did this to lengthen the port, and get a correspondingly lower resonant frequency. A straight port tube would have required a larger speaker cabinet.