Ryan connects his sound bar to his TV through the headphone jack and over time, it gets harder to hear. He can have it turned up to 90% and it sounds like it's barely on. Leo says that he should try changing the sound on the TV, not the sound bar. It should raise or lower it.
There may be a setting in the TV's sound settings to treat it as a line out. That could fix it. Connecting to the optical jack is the solution, if he can, because it's a fixed level.