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Parametric EQ Q Values
Possibly a slightly subjective question, but what would you consider a low, medium and high q value to be? I tend to just go by ear, never really thought about it before.
Reason I asked, passed a mix onto another engineer, for his thoughts/advice on it, he said cut a bit at whatever frequency, medium q. Got me thinking about how, for a fairly technical if creative process, we use some really vague terms now and then!
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If you take a typical three-band approach to EQ -- bass, mid, treble, for example, then a band covers roughly three octaves.
So a low Q filter might be expected to affect an entire three-octave band, which requires a Q value of 0.4.
A filter with a 1 octave bandwidth has a Q of 1.4.
A filter with 1/3 octave bandwidth has a Q of 4.3
A filter with a 1/12 octave has a Q of 17
So in ball park terms, the previous suggestion is a pretty good one.
Q=0.5 is pretty wide, Q=1.5 is medium, Q=4 is narrow and Q>10 is very narrow.
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Technical Editor, Sound On Sound