Uh... that's all TV. Cable, satellite, and OTA (maybe to a lesser extent with OTA).
Regular programming uses sound leveling (drawing a blank on the proper term), so that not all sounds in the broadcast are at maximum volume. Thus, you get a range of volume levels... and thus makes it seem like commercials are are louder.
They are not, not technically speaking at least. Commercials cannot play at a louder volume than your volume setting, but many commercials forgo the use of realistic sound engineering, and broadcast all sounds at the same level, the max.
If regular programming had sound levels where all sounds were at equal at the max volume, they would sound just as loud as commercials. If everything was the same volume as a nearby explosion in a regular program, or if you heard everything at that same volume and then compared it with a commercial, it would sound the same.
It's annoying as shit, but nothing fancy going on. Commercials are actually being less fancy but not using the same sound engineering as regular programming.