For the record, those Logitech systems are GREAT bang for the buck, but the sats have a fatiguing factor. I like the subs just fine, little boomy.
I used to own the Z2200s which had an 8inch subwoofer that was build just like that 10inch. Giant flared port (never heard port noise) and the system as a whole could reach insanely loud levels and still remain clean. I used it outside for parties and it would easily fill my backyard with stupidly loud music. If you have the money and don't mind the sats, they're great speakers.
SheepStar