Quoted from another forum.
z560 boomy as hell
z680 makes the 560 look tight
z5300 even sloppier then the 680
z5500 10in sub with a bigger port in the same size encloure? Only time will tell but I have my strong doubts.
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I am NOT trying to flame.
This is just a remoded 680 system, once again the logitecs lack tweeters, The bass will most likly still be distorted and "boomy", it seems all they did was change the look.
Anyone is better off with the klipsch 5.1 ultras,