I got these Z623 speakers from JB-HI FI last week and I cannot be happier they r bloody Brilliant speakers. The sub-woofer is Crystal clear no matter what volume u put it at, well worth the $137 I payed. I don't have any complaints about these speakers well done Logitech keep the good work up ????

I think these speakers are great value at $100 which is the price you can often find them discounted to. Probably wouldn't pay $150 for them though. Overall good performers, can definitely get loud. Clarity of lyrics is good but instruments can get a bit muddled up. Plenty of bass, not the clearest lows but good for $100.
Loud, pretty good low and high end for the money, good for movies and most music
Some music tracks aren't reproduced as well as other tracks, lacks some midrange frequencies.

Turn it up and it's loud and clear. I crank them up when i'm home alone and not using headphones, and i can see the woofer vibrate anything near them. The bass does not need to be turned to full for some decent bass. Great speaker size which doesn't use too much desk space. Would buy a second pair for my bedroom tv if i didn't use a soundbar.
Value for money

I've been planning on getting these speakers since I heard them at a friend's house. For the price they have excellent sound. Better than the 5.1 out of cheaper Logitechs. The sound still sounds like it's coming from the centre even without a centre speaker.

Speaker leads are only 2m so position carefully. Woofer is probably going to be on the ground.
Sound clarity, simple setup, less cluttee
Cable length 2m

I bought the z623's because my five year old Logitech's had given up the go and I was wanting to get a much better set than I had been using, and I certainly picked a good set. The speakers are heavy and solid, offering a deep sound that resonates really well. The materials are very nice and the cables are all good quality. The sound is incredible! 200w is ample, and even at half capacity they make my desk shake. Whether it's music, gaming or movies you do on your PC, they are definitely a good investment.
Big sound, quality feel, well priced
Just remember it's a big set of speakers

This 2.1 system has plenty of kick in the bass department, and sounds noticeably brighter than cheaper Logitechs I have listened to. It has huge power so you can really get it loud from devices such as Smartphones and MP3 players. The separate bass dial on the front is handy so in the late night you can turn it down to avoid bass echoing through the house. I use these both for gaming and music from my computer and I am very happy overall.
Power and bass dial on front, no separate wired remote or anything, Great amounts of bass without losing high end
Not sure if it's just my unit, but when it has been off for a while it crackles when I adjust the volume at low levels. It quickly goes away if give the volume a bit of a wiggle up and down.

Had these pc speakers for a few weeks now and i must say i am very happy with them! I got then online for $160 delivered and for the price i was very surprised! I wouldnt pay any more tho. The sub is very good but the speakers can tap out with poor quality mp3, cant blame the system for that i suppose, Connecting is simple and every day use is as good as it gets. Nice to look at as well. sounds good with music and movies!
BASS! its awesome punches above its weight!

These speakers are compact (well, the satellites are anyway), and sound great. The top-end is a little recessed and they can be a bit shrill when pushed, but overall they perform really well. Best features are the bass - there's heaps of it and it's reasonably deep. And they go REALLY loud! The only disappointment is the headphone output - it's not loud enough.
Plenty of bass. Heaps of volume.
Sub is pretty big for a "desktop" system.