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On the logitech sattelites, they use paper drivers and cones instead of domes for the center. Is that good or bad? I know ports on each sattelite reduce quality a bit compared to sealed boxes, but power is nice..
Actually, if you ask me (which maybe you didnt

), the ports on the logitech Z-560/680 satellites are probably their best feature.
One of the main problems with sub-sat type multimedia speaker setups is that the satellites often do not go low enough so that the 'sub'woofer blends in seemlessly (i.e. produces only frequencies that are low enough to be effectively non-localizable).
The porting scheme of the high-end logitech speakers solves this, and allows more mid-bass extension in the sat's than would be otherwise possible.
The material of the driver isn't actually that important, so long as it's relatively stiff and light. Paper works quite well and is cheap, which is why it's so popular.
Unfortunately, the reliability record of the "high powered" Logitech speakers has been rather poor, and in order to exchange them after failure you must send in the control panel. Do NOT break the control panel, just in case.