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having a 10.2 z5500 system would just sound twice as bad as a 5.1 z5500 sound system..

You might have 10.2 speakers, but it would still be only a 5.1 surround system. Also, more speakers are not necessarily better.

"A manufacturing defect in the z-5500 product line causes occasional popping or radio interference under certain circumstances."

Wow and all this time I thought it was something with my POWER Inside the household?

In order to replace these speakers what do you guys suggest?

Call LOGITECH?