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Q values for equalizer. How does it measure?

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saratoga:
As I recall, Q is just the inverse of the fractional bandwidth of a filter or other linear system. So a Q of 2 means a fractional bandwidth of 50%.  I haven't played with it in Rockbox, but I assume a Q of 2 in a 1KHz center frequency filter would mean you'd have a passband extending out 500Hz in both directions.

Chronon:
Nice summary, saratoga: This means that a small Q corresponds to a broader spectral width.

Imagine a peak in the gain (vs. frequency) spectrum.  The fractional bandwidth refers to the width of this peak divided by the center frequency of this peak.  Q factor refers to the reciprocal of this as saratoga said.

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