Hi, We just got cable, before had a converter box, we do not have a cable box, just hooked the tv straight to the cable jack on the wall. When we hooked it up the speakers are making a lot of static noise, so much we can barely hear what's on tv. We switched it to mono, but for some reason when we change channels it doesn't have mono set on the other channels. Anyone know why when we have it on sterio it has all the static noise and how to fix it?