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Parametric Equalizer "Q" Definitions and Bandwidth
https://www.andyc.diy-audio-engineering.org/parametric-eq-parameters/index.html
In the Hypex amplifier manual, the revised Q definition is described as follows. "Dip/peak filter. For peaks, Q is defined by the poles. For dips, Q is defined by the zeros. Thus the same filter with opposite gains will cancel." This is the definition of Q that's used by the Multi-Sub Optimizer software (MSO), so I'll call it Q m, the "MSO Q".
Q. What are filters and what do they do? - Sound On Sound
https://www.soundonsound.com/sound-advice/q-what-are-filters-and-what-do-they-do
Most audio filters on mixing desks (and DAWs) will have a slope of 12dB or 18dB per octave, and in synthesizer filters the slope may be as steep as 24dB per octave. If an 18dB/octave high‑pass filter is set to 80Hz, any audio an octave below that (at 40Hz) will be attenuated by 18dB, and an octave lower still, at 20Hz, it will be attenuated ...
Q factor vs bandwidth in octaves band filter -3 dB pass ...
http://www.sengpielaudio.com/calculator-bandwidth.htm
A high filter quality means narrow-band filtering (notch), with a large Q factor. This results in steep filter flanks with a small bandwidth. A low filter quality means broad-band filtering, with a small Q factor. This results in flat filter flanks with a large bandwidth. The larger the Q the more narrow is the resonance peak.
Q. What's the difference between filtering and EQ?
https://www.soundonsound.com/sound-advice/q-whats-difference-between-filtering-and-eq
Most analogue audio equalisers and filters are 'minimum phase' designs — the well known Butterworth filter designs, for example — where some frequencies experience a different amount of 'processing' delay to others. The steeper the filter, the worse the phase-response variations become, which inherently distorts the waveform shape.
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