I really don't know anything about speaker technology, so I can't comment about the findings in the article, but every review I've read seems to say the same thing.....that the Z-560s are great speakers and the fact that they can be had for around $150 in some cases makes them too good to pass up. Personally, I could really care less if the specs have been *tweaked*. If they sound good, then that's good enough for me. I'm thinking about picking up a set soon.
From 3DSoundSurge:
The Logitech Z-560?s major strengths are the impressive subwoofer, the very good quality on the satellites, the good upper bass extension of the satellites, the amplified headphone output, the very good overall dynamic range of the system and the relatively low price. Even without factoring in the changes to the final retail unit the performance of the Z-560 is amazing.
When it comes to music performance it?s very good although you can find both less expensive (AMR-150) and more expensive systems (MM2000, and Crossfire) that are clearly more even in the frequency response. The ProMedia 4.1 also appears to be slightly more even, but not quite as clean, particularly at higher volumes. This is an area that the tweaked system equalization on the retail Z-560 should improve the performance and even as is the listening experience is very enjoyable. In fact, if you want to belt out your bass then it?s hard to imagine anyone complaining about what the Z-560 delivers, but for those looking for a bit less bass it will, just as with the midrange, depend on the extent of the changes to the retail unit.
Shifting to games and movies, I can state with confidence that I have never heard a better 4.1 system for those uses at this price point and even going well beyond (ProMedia 4.1, Crossfire, MM2000) the Z-560 is competitive!
Overall the Z-560 is an outstanding product, one of those rare beasts that leaves you scratching your head asking again and again "how do they sell this system for just $200?" Perhaps when we try to delve into more details of the system for our full review we will come across the answer to that question but one thing that won?t change is my very positive impression of the Z-560.