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That way, a person could goose the sub for movies, but not for music if they wanted to.
I agree; in my experience, it's a very useful feature. In the ideal world we're supposed to aim for a flat frequency for all sources. However, in the real world, I've found that listeners tend to like their bass slightly exagerrated when watching movies and slightly subdued when listening to music.

Best,
Sanjay
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Sanjay