The z623 sound is amazing! I listen to mostly Trance and Electronica in general, but I can tell you everything sounds fantastic on it. I also own the z2300 which as of right now I have hooked up to my 3D TV, but previously had attached to my computer, and I can tell you that my new baby falls only slightly behind it in terms of bass, but just a little.
The satellite speakers I would say sound actually better than those in the z2300, I certainly do not regret buying it at all. Some buyers of this system has complained saying the connecting cables are too short, I must agree to some extent, however for most computer users the supplied cables are just enough, in any case if longer cables were needed it is easy to go buy one audio extension cable, they are less than $5 in any electronics store, you just need to buy the cable and an extender plug and that’s it, cable length was an issue for me with my z2300 because of the way I have it set up with my TV and solved it that way.
The z623 Speaker System has the power of 200-Watts RMS, it is THX Certified and connects its left satellite speaker to the main Subwoofer using a standard RCA cable which allows for the solution explained above in the event you need to separate the speakers more, the AUX In integrated jack on its left speaker allows you to connect any external device such as your IPod, WI-FI radio or regular mp3 player to the system.
The system is so loud that most users will probably put the volume half way, I have tested different types of music and even at very high levels (where the walls start to rattle) I can hear no distortion of the sound at all.
If you are looking for an inexpensive audio system for your PC, iMac or even your TV this device will not let you down, clear highs, crisp mids and an extremely powerful bass make the perfect combination, you can’t go wrong with this piece, other system with this power cost twice as much or even more.
So many things are great about the z623 , I could mention Bass, Sound, Quality and Appearance. Aside from not having optical audio, I see no wrong, but this was expected. Buy it today!