Find the audio book by David Davis. I can't think of the name of it. it also might be available through the AES.
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You might consider downloading the manual for our parametric. It's very clear on how these work and how they should be set up. This is a link to the PARC pages, you will see on the left hand menu column a link to download the manual. It's a pdf file. Rives Audio PARC |
Parametric EQs are fairly basic in their operation. Most contain two different types of EQ. The first is hi and lo shelving filters which are akin to traditional hi-fi treble and bass controls. A hi shelf filter can increase/decrease the frequencies above a user selectable frequency. The lo shelf filter does the same for bass frequencies. The parametric part of the EQ is very similar to the shelf functions, but with a few additional tweaks. Whereas the shelf filters effect frequencies above or below their selected values, the parametric EQ has a center frequency that effects response to either side of the selected value. Visually speaking, increasing values produce a hill (or valley) in the frequency response. The "width" of the hill/valley is controlled by the "Q" control. A low Q valley produces a very narrow bandwidth hill/valley that will only effect a small number of frequencies, say 1/12 of an octave around the center frequency. A high Q will produce a very broad hill/valley that can cover 2 or 3 octaves. As a point of comparison, a graphic EQ is a parametric EQ minus the Q control. For increased flexibility most parametrics have multiple parametric sections. Here's a link to one of the better available pro units. Manley Massive Passive. It's a stereo unit with each channel having 4 separate parametric EQs plus hi and lo filters. This unit has a feature not often seen because it allows the user to also select shelving or bell shaped curves for each individual parametric section. The pictographs give a good idea of how that control functions. Parametric EQ was invented in the early 70s by the recording engineer George Massenburg (Linda Rondstadt, Little Feat, Lyle Lovett, etc.). |