NCAA football 2009 (PS3) 7.1 question? Matrixing issue, game or what

[STARSCREAM]

Hey guys, for anyone who has this game and has 7.1 could you check something for me. I was playing it last night and am having my pio elite receiver matrix it to 7.1 and I came across either an audio issue or its just how the game sounds. When the crowd starts to get really loud there is a wierd swoosh type sound that just repeats outta the back 2 speakers. The best way to check is when your team is on defense to make one of your players make the crowd get louder by making him ask them to get loud and once they are loud the sound eminates outta the back 2 surrounds. I have watched tons of movies and played other games and haven't heard this or had problems so that makes me think its the game. It is really annoying though and I may just have to leave it at 5.1. Like I said, you can still hear the crowd cheering but their is some kind of wierd sound as well that doesn't sound natural.