Reply To: Ringing Out The Room – Channel or Overall PEQ?

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Dick Rees
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Thanks, Andreas.

For those of you interested in the different types of GEQ filtering, here’s another good link:

http://www.rane.com/hal/MobileHelp/Advanced/Content/Reference_Block_Topics/BlockReference_Filters_GraphicEQ.htm

I’m not a big fan of computer screens (eye problems make them hard for me to read), especially if they draw the attention of a sound person to the visual realm instead of the aural. But the EQ trace shown on the Qu screen can be very informative…should you actually own or use a Qu console.

The common Q value of GEQ filters has been 1.4. Filters with this Q value act over a one octave range, the 1/3 octave nomenclature denoting the center frequencies of the filters, not the width. If you wish a visual representation of such a GEQ filter, set one of your parametric filters to have a Q of 1.4 and have at it. I believe this is 1/3 on the Qu, but I’ll have to check when I get the console out of the vehicle in a couple of days.

Here’s another link, this one dealing with filter Q and bandwidth:

http://www.sengpielaudio.com/calculator-bandwidth.htm

DR