Edifier R501 MK II

best 5.1 in that price range 

mark two

it's nothing really, just an improvement over the old version

the old version had 2 full range drivers in a satellite but the MKII  had a single woofer and single tweeter in their drivers

the new one with tweeter helps sound better on highs like bird chirping or cymbal crashing.

normal desktop computer should be able to support 5.1 channels
if not I'd suggest getting a soundcard

if not you can use the stereo input provided at the back of the R501 subwoofer.

do note 5.1 speakers usually don't have sound for all channels

music is in stereo so it shouldn't have surround sound