I've revised my review after a couple of days' listening.
These provide a good stereo effect and, especially with vocals, the speakers can 'disappear' so the sound seems to come from all around and not identifiably from the 2 sound sources.
Connections are all nice and accessible and the on-off/volume switch is fine; volume increases smoothly (linearly, not exponentially). The speakers are hard-wired though, which restricts positioning.
The high frequencies are acceptable and your cymbals/horn sections ting and er.. 'trump' pleasingly (although they seems to peak at Polystyrene-squeaking frequency, whatever that is).
My main complaint is with the ringing bass: there is a strong peak around 150Hz which makes me cringe when a note hits it. Bass drums can sound like a knock instead of a thump. This is a shame as testing shows that they are capable of going a lot lower; the passive radiators (bottom 'drivers') work as they should and travel more than the powered (top) driver at lower frequencies.
With a parametric equaliser this peak could be smoothed-out which would increase listening pleasure. Given the opportunity, I'd also try to boost the frequencies towards 15kHz.
But one shouldn't have to play with the source signal and even though these are relatively inexpensive, there is a LOT of choice in this price range for 2.0 sets, for example:JBL Jembe 2.0 Computer Speaker System - BlackGenius SP-HF 500 A Wired ActiveTrust 19021 Tytan 2.0 Wired ActivePhilips SPA1260 Wired Active
I also use Logitech's Logitech X-140 Multimedia Speakers (2.0)
which sound more involving right out of the box, have a protective grille and thicker, more rubbery wires. Although other X-140 users reported whining and noise, mine work fine and I would not consider these Z200s an upgrade.
The Z200s ARE still growing on me though, and, listening to Rush 'Here Again' at close to top pelt they sound pret-ty good!
PS. Although new, mine arrived with fingerprints all around the volume knob -from the assembly worker, perhaps?
[My ref: Slightly lacking Logitech monoliths. EQ would add potential. Feb 2014]