I have noticed that some commercials are way louder than the shows. I don't know about online though as I haven't watched any. But the House and Senate passed, and Obama signed in November, a new law to reduce the volume of commercials. Stations have until Dec this year to comply.

If you're interested, there are articles online such as:

http://www.msnbc.msn.com/id/17229281/ns/business-consumer_news/

and:

http://www.cbsnews.com/8301-503544_162-20025823-503544.html
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