Commercials are louder than the TV show because advertisers want to grab your attention. They use sound to make their ads more noticeable and memorable. The Commercial Advertisement Loudness Mitigation (CALM) Act passed in 2010 makes it illegal for commercials to be louder than the average volume of the channel they come on. However, some advertisers still try to get around this by using tricks like compressing the dynamic range of the audio or boosting the volume of certain frequencies.