I tried to watch Line of Duty last night but found the music drowned out the conversation so that I heard about 60% of it. I find this with a lot of the programs on TV. It is time that TVís were fitted with a mute button to turn unwanted back ground noise off. Audio description can be turned off as can subtitles so why are we not able to turn off irritating loud music. It may be possible for younger people to hear through this music but older people will have trouble hearing the dialog. This has been brought up many times in the past and we are informed that people like this noise,but next time you do a survey about this please ask older people
I suspect that younger people in executive positions at consumer companies don't see it as an issue.
Also the music + voice is an integral part of the program makers's package.....so the director likes it that way....while audio description and subtitles are a service that is added and can therefore be omitted easily.
Can you adjust your surround sound?
I use a so-called "Hafler circuit" for surround sound. Initially, I had the same problem you describe. The surround sound, on some material, drowned out the dialogue. Very annoying.
The fix, in the Hafler circuit situation anyway, was to add 16 ohms in series between the two surround speakers (which are wired in series with this scheme). That was enough to tame the surround effects.
I would expect that any actual Dolby surround processor has a volume setting for the ambience level. Turn it down, and that should solve the problem.