Just got an auzentech x-fi prelude sound card to go with my z5500's and i cannot get 5.1 sound when i select that option for my speaker configuration. when i do the test on the speakers i only get noise from the front left & right leaving centre, back l & r and the sub with nothing. i'm using the latest driver from the auzentech site btw. so gaming and watching films in 5.1 isn't happening for me at the moment. please enlighten me as i'm scratching my head and coming up with nothing