my ntl digital box is connected to a bose lifestyle system by a standard 2 phono lead. i've started to notice that on certain news and sport channels (itv sport is particularly bad) the is a large ammount of interferance through the rear speakers. i would describe it as sounding like running water. is this a problem with the broadcast or my set up (other channels i.e music and movies sound fine)? have others noticed this and is there any solution?