x-540 Logitech Rear/Center Speaker Stops Working

[Neik]

Hey, I have a problem with my speakers, My Rear speakers use to work with my 6.1 channel sound card, but no it doesn't work anymore, I've checked my Speaker Configuration with Sound Effect Manager, I Put 6 channel mode for 5.1 speaker Output and the rear/center worked perfectly, I use to have my center/Subwoofer Outlet to my Mic In. But now only 2 of my 5 speakers are working, My songs arent playing from my rear speaker anymore. Theres a button called matrix which turns on the center/rear speakers for 2 channel sound card. But the sound from the matrix mode isn't that great. Iv Tested my Rear and Center Speaker with the sound effect manager and it appears to get sound out of them. But i dont know why the music i play don'tt come out of those speakers.
Can anyone help me?

My Specs
Windows XP Home Edition
1.5 GB RAM
2.40 Ghz Processer
256 MB Graphic Card RAM

[soldier101983]

did music use to play out of your rear speakers only music does not tend to come out of surround speakers unless there is a setting for it

[Neik]

yes they use to come out of my rear speakers too. now they stopped working?

[Neik]

I turned on something called s_eax in one of my games and the rear speakers started working, is there away to enable this on my desktop?