The direct sound compared to my other 2.1 system shows the expected result: Sonically unfortunately mediocre and the expensive price is not worth much. Processing moreover mE cheap and optics - well, wems like. But it is on top of the portion about 20 times Logitech.
Already have the 2.1 system Powermax 1300 from TEAC, this has cost only 49 and is worlds better. Subwoofer enclosure made of heavy wood, with bass and super satellites - 1A. U heights. Bass can be adjusted separately. Sounds worlds better than the Z4i, but there's no longer for sale. Get the Wavemaster MX-2 2.1 taste, looks very similar to the parts namely the Teac.
Conclusion: disappointment. It shows once again that the own impression is irreplaceable. Logitech should rather concentrate on's "core business" -. Their mice and keyboards are really good.