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Shelf EQ With Zero Gain

Ron Texas

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Sometimes in the Oratory1990 headphone presets I see an entry like: lowshelf 100 Hz O Db Gain, Q .71.
How does one shelf with zero gain? What does this mean?
 
It's low self adjustment filters to your liking for bass with 100 Hz transition filter towards Butterwort model with Q of 0.71 and it translates decently influence reaching all the way up to almost 500 Hz. Or to the equal loudness contour to SPL if you wish.
 
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