I remember a lot of letters in the Radio Times complaining about the speech in BBC drama being more or less inaudible, because the actors weren't speaking clearly. In a lot of drama productions, they seem to talk at the same level you'd talk to someone in the same room, or the same corner of the same room.
We watched all 6 episodes of 'new ' nand the review that referred to Jim as 'the whispering widower' summed it up perfectly! Even if your voice is being amplified electronically , you do need to speak clearly and enunciate! I remember my mother complaining that 'Oh, your dad mutters all the time nowadays, I can't hear a word he says!' but since retirement loomed, my husband has started muttering as well! It's as if his voice has retired in anticipation of him finishing work lecturing and giving talks in a few years!