Weight has absolutely NOTHING to do with quality--if it did all the Peavey speakers would be the best you could buy. The quality of a sub depends upon the length of the speaker's throw, and the material the speaker cone is constructed from. You can have a very light subwoofer and still blow the windows out of the venue. That Logitech Z-5500 sub is awesome. Fran, however, wouldn't know--he never tried or owned one.
Cheers,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)