I currently have the Logitech Z5500 speakers. When I got my Windows 7, I noticed sound only came out from the Subwoofer and the 2 front side speakers. I updated my drivers but it still didn’t solve my problem.
Apparently you have to tell Windows 7 what type of speaker set up you have. You have to manually set it to a 5.1 or 7.1 speaker set up.
After doing those steps you should be getting some sound from all speakers. Don’t expect the quality to be as good as Windows XP because it is not. When playing games I like it loud so I use the 6 Channel Direct Effect for my Logitech Z5500 but on Windows 7, it’s just such a disappointment.
Thanks! Finally I got my 5.1 working… you are right the sound quality does suck compared to XP.