Click here to purchase the entire book in PDF format. Parametric Equalizer A parametric equalizer is one that allow the user to control the gain, centre frequency and Q of each filter. In addition, these three parameters are independent - that is to say that adjusting one of the parameters will have no effect on the other two. They are typically comprised of combining filters and will have either reciprocal peak/dip or constant-Q filters. (Check your manual to see which you have - it makes a huge difference!) In order to give the user a wider amount of control over the signal, the frequency ranges of the filters in a parametric equalizer typically overlap, making it possible to apply gain or attenuation to the same centre frequency using at least two filters. The obvious advantage of using a parametric equalizer lies in the detail and versatility of control afforded by the user. This comes at a price, however - it unfortunately takes much time and practice to master the use of a parametric equalizer.