Re: Surround sound
THX is a standard of sound quality really yeah, so you know you can expect the best sound from the speakers when joint with a corresponding sound card, and game/movie.
As for speakers, Logitech are never really bad, though these it doesn't have the best signal to noise ratio for the price (Creative give about 98db), or the frequency response which is 18khz to 80hz.
The most people can hear is 20khz to 20hz...and so that 80hz is pretty high for a cut out for bass and so not so good.
A good Creative set would blow these out of the water, with a frequency response of around 20khz to 40hz which is much better, especially for the amount of watts those speakers use on the bass unit...
I would look for another set to tell the truth. They just wouldn't do a good sound card justice, especially for music... though your bound to get a loud sound with those because of the wattage
Abit IP35 Pro / Q6600 G0 / Zalman 9700 / 8800GTS 640mb / 4x 2GB Corsair XMS / X-FI Xtreme M / 1x 1TB / Antec 900 / Logitech Z-5500 / Samsung 20inch