Logitech X-530:

-Although not perfect, Logitech X-530 speakers have generally excellent sound quality at a low price.

-The X-530, the subwoofer and satellites, are almost identical to the X-230, which is a 2.1. Exceptionally, the front right satellite acts as the volume controller.

-The inputs of cable connections 5.1 and audiocables of satellites, are on the subwoofer. The headphone jack and volume controls are located on the right satellite, but the bass control is located on the back of the subwoofer and can be difficult to achieve it. What I do not like is that there is no treble controls.

-The bass is very good in most movies. Adjusting the bass using the dial on the subwoofer produces a more bass in movies. The midrange is crisp and clear.

-High-pitched details were sometimes lost or a little subdued, but this was made up for by the immersive and convincing surround sound effect.

-I was also impressed with the X-530's sound quality when playing music. Bass music are satisfyingly full and rumbling, sounding a little richer and deeper than the already impressive bass on the 2.1 X-230. Orchestral music, as well as jazz and blues pieces, sounded warm, rich and detailed with no hint of distortion. Vocals and instruments in pop and electronic music sounded clear and generally well-balanced. 

-I have two same models, and I can say it's a good/medium 5.1 pc/dvd stereo.

-The X-530 may be Logitech's cheapest PC surround sound set. It's not quite perfect and the bass control could be more conveniently located. 

-You can spend a little more, and you can buy a Genius sw-6000, is the 5.1 maded of wood and 200w of power. It has its drawbacks, but is good.

The price of:  
                                                   - Logitech X-530 is 40/60 €
                                                   -  Genius sw-6000 is 80/110 €