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Post by jcoutu1 on Jan 21, 2014 9:46:10 GMT -6
I think a lot of the inductor eq's on the market have a q that changes with the gain...higher gain = tighter bell, less gain = wider bell. Is this right?
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Post by svart on Jan 21, 2014 9:57:36 GMT -6
Yes, because the "bell" or rolloff of the passive filter usually have a set value of between 3 and 6db/octave. Think of it like an iceberg, with the water being the midway point of the gain (unity gain). Since the iceberg has more bulk under the water than above it, the more you boost, or raise the iceberg, the more shows out of the water and thus the wider the width of the base..
That's also not taking into account the changes in the impedance of the filter as feedback is changed throughout the gain range, which can also affect the shape of the rolloff too.
I hope that's not too generic..
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