What is EQ and Filtering?

In by phoenixgreen

Creative Effects Processing - EQ and Filtering

Lesson Overview

EQ which is a common abbreviation from Equaliser refers to a hardware unit or software that is able to adjust the level of incoming audio by frequency.

EQ next to compression is the most commonly use effect within audio production whether  it be in a live environment or in the studio environment.

An EQ allows all frequency to pass though unchanged but allows for specific areas of frequency to be raised or lowered in level, known as a boost for increased levels and a cut for decreased levels.

There are a few different types of EQ units available that have different characters or indeed different purposes altogether. Logic does support a variety of different EQ modules.

Channel EQ
, named to be the most commonly used EQ in Logic Pro. This is a parametric multi-band EQ. This means it supports more than one filter across the frequency spectrum. The parametric element simply means the filters can be moved both up and down the frequency spectrum as well as provide cut and boost with varying Q controls. Channel EQ’s are designed to serve the most commonly required mixing purposes while remaining uncharacteristic and transparent. (Note there is a Linear Phase version of this EQ also)

Match EQ, is a specialist tool for collecting data on the frequency content of one sound source and then applying that profile to another sound.

Logic Pro X now also features three character EQ units. These units look to create some EQ vanity providing an API style graphic EQ which has fixed frequency filter points
A vintage PulTec style EQ which has the ability to both boot and cut the same frequency spot giving it a very individual sound, As well as providing great broad brush boosts.
And a NEVE style Channel EQ unit that works like a parametric EQ without the modern display options.
  • Task

    Using the parametric EQ try both booting and cutting with just one filter, sweep this across the frequency spectrum to gain an understanding of the differences created by applying each type of EQ in different areas. It can be helpful to test this on white noise.