According to Life Inc:
Shouting TV ads are soon to become a thing of the past as a new law goes into effect Thursday at midnight mandating that the volume of commercials has to be within a range of 2 decibels (db) more or less than the programming around them.
Joe Addalia, director of technology projects for Hearst Television, was in charge of figuring out the right technology to make 31 transmitters compliant with the new regulations. He told TODAY that 2 db was “the difference between viewers reaching for the remote and not.” TV stations want to encourage watchers to leave the remote alone, he said, “because right next to the volume button is the channel button.”
Joel Kelsey, legislative director for the media advocacy group Free Press, previously testified in Congress about the need for volume regulation on commercials. Since nearly the beginning of television itself, loud commercials “have consistently been one of the issues consumers are most energized to write the FCC about. They don't like being screamed at every time the program breaks to buy deodorant,” Kelsey told TODAY.
However, it took an act of Congress, the “Commercial Advertisement Loudness Mitigation Act,” or CALM Act, to prod the FCC into the necessary action. The bill passed unanimously in the Senate.