Hi, I exchanged our cable boxes for an "issue" we though were having. Once we swapped the cable boxes, the volume on the TV has to be turned almost all the way up to hear it clearly. Up to 50 on the volume bar instead of the normal 10-15. We have an NS-46E481A13 insignia. It's pretty annoying to have to turn it way up just for normal sound. Any help would be greatly appreciated.