I know Star's audio chain. It was set up to have a very, very bassy sound. The extra bass helps on some of the harder rock songs they play because the guitars and vocals are so compressed that the bass drums can get drowned out sometimes. The big bass boost helps to bring out the mids and highs in a different way, but it's very unique and it keeps them loud. By comparison, when Q100 first started broadcasting at 99.7 they were clearly still using the 99x processing. Notice that Q100 at 99.7 had a lot more bass in the 'punch' region than they had when they were on 100.5. Different processors at Star and Q100/99.7 but it's the same principle both ways. With Star's setup there will always be a big jump in the bass on audio that's compressed more lightly (including voice), that's the nature of the processor they use, but it's very consistent and good for their market position.