@fairfax
Sometimes, particularly with the news, there is a glaring contrast between the journalist's voice - recorded in a studio and, possibly, audio enhanced for maximum clarity - and their interviewee's speech which is muffled. Even when they're in their own front room, it is as if the wind noise muffler is still on the microphone.
I sit there windering what they do and don't teach on these media studies courses we've heard so much about!
I missed the program itself; what are you contrasting the poor sound quality with? Did the programs immediately before and after have good quality sound?
Does your TV have menu functions? If so, have the sound settings been altered from where you last left them?