Since ad sections are your typical break from a program to get to the fridge or toilet or whatever, the DSP transform makes sure you still hear the ads and pick up dialog even when far away from the TV.

Downmixing audio so that you can both hear dialogue and not lose eardrums to music and 'splosions seems to be an intractable decades old problem for the movie industry but it sure as hell been solved a dozen times over by the ad biz.