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The logitech Z-680 are the original. The Alesis are exactly the same, but with their brand on it and another color (and if I remember well, Alesis gave different cables too). So sound is the same.
Keep in mind they are designed for multimedia. They are easily one the best sounding multimedia speakersets around now, but I wouldn't recommend them really for producing (even with the sub turned down almost completely, the lo freqs are still overpowering). Good sounding, but not linear at all. Same goes for the Klipsch. They sound good, I would even say too good. They embellish your sound, which isn't recommended for producing. And for dj'ing? Little bit overkill to take a 5.1 system no?
I would only recommend them as computer speakers, and maybe for home cinema (where you'd still be better off getting dedicated hifi surround systems).
PS : we're talking about speakers here, sound quality is of importance, not looks.
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