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Parametric EQ Q Values

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Parametric EQ Q Values

Postby UneducatedWeasl » Tue Jan 29, 2013 6:24 pm


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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Re: Parametric EQ Q Values

Postby SafeandSound Mastering » Wed Jan 30, 2013 11:37 am

Hi Jack,

In my mind.... 0.5 wide, 1.0 medium and 3.0 + narrow.


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Re: Parametric EQ Q Values

Postby Hugh Robjohns » Wed Jan 30, 2013 2:22 pm

The music spectrum, from 20Hz to 20kHz, covers ten octaves.

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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