i have a Creative Labs extreme music 7.1 sound card. and for speakers i have Sicuro RW-670XL speakers. everything works fine until i turn my sub on. when i turn it on it makes weird sounds, it bends sounds, and makes them all weird, and spooky sounding, its a unexplainable sound, but only for about 10sec, then it goes to normal for about 2min, and repeats its self. any ideas why it does this?