No stereo audio on Cable TV

[YamahaFreak]

This is an annoying problem our household has been dealing with for years, with no solution in sight. I figured maybe some of you folks may have some insight. None of the TVs connected to our Spectrum cable boxes have stereo audio. I have checked and re-checked every setting in the TVs and boxes, to no avail. Tried composite, component, and HDMI out...nothing. Totally mono sound across the board. The one TV with a Digital Adapter (tiny square box) has stereo, just none of the actual cable boxes. They are Technicolor (Cisco) model 4742HDC units. I am beginning to wonder if this is a wiring problem in our house (damaged cable, bad splitter, etc.) Spectrum themselves are of no help.

Nothing is quite as annoying as trying to watch a blockbuster action movie, or listening to a music channel, with essentially one speaker!