The slope of a filter refers to how aggressively the sound beyond its corner frequency is attenuated.įilter slope is usually associated with HPF and LPF and types, but some modern EQs allow you to choose the slope of bell or shelving bands as well. You can use these to eliminate offending room resonances that can arise from recording in untreated acoustic environments-but be careful, using many steep notches can create a comb-filtered, phase-shifted sound. Notch: Notch or “band-stop filters” are used to selectively eliminate extremely narrow frequency ranges. Think of low and high shelves like the treble and bass controls on your stereo system. This EQ type is effective for making broad tonal changes. Shelf: Shelf or shelving filters boost or cut all frequencies above or below the corner frequency. Boost or cut at specific points and decide how broadly to affect neighboring frequencies with the Q control. This is your go-to choice for sculpting and tone-shaping. Their shape can be manipulated using the Q parameter. The steep drop-off around the corner frequency can easily tame boomy low-end or piercing ultra-high resonance.īell: Bell filters are your standard tools boosting and cutting. Reach for these filter types when you need to clean up issues at the extreme ends of the spectrum. A low cut is known as a high-pass filter and a high cut is known as low-pass filter. High-pass (HPF) and low-pass (LPF) filters: These filters are named for the frequencies they leave unaffected, rather than the range they cut. The most common types are high/low pass, bell, notch, and high/low shelf. The filter type determines the general shape of the EQ band. I’ll explain each one and how they affect your sound. If you break down the settings of an individual band of EQ, they'll refer to basic characteristics of filters: type, slope, Q, and gain. The qualities of the filter that your EQ uses for its cuts or boost determines a lot about its sound-and the best way to use it. Filters and BandsĮQ is essentially a special application of a filter. Think of EQing as sculpting… You’re working with raw material-the existing frequencies of your sound. Remember: EQing doesn’t create new frequencies. This effect is called masking.ĮQ is used in mixing to help reduce the effect of masking so that each instrument can be heard clearly.
In fact, they’re overlapping so much that it can be difficult to to hear them individually on the recording. They each have distinct timbres, but when we record the performance with microphones, we notice the two sounds overlap. Going back to our example, let’s say we record the french horn player and the guitarist playing a unison melody. Keep this concept in mind as you move through the basics of EQ. When you use EQ to alter a sound, you’re really changing the volume of its partials relative to the rest. If not, they’re inharmonic.Ī highly harmonic sound like a bowed cello string is rich in evenly related partials, while a highly inharmonic sound like a cymbal crash is made up of only unrelated ones. If the partials are related to the fundamental by a whole number ratio (ie, 2:1, 3:1, 4:1 etc.) they’re harmonic. These basic components are called partials. Complex just means any sound other than a basic sine wave.Īll complex sounds can be broken down into simple sine wave components. Unique, identifiable timbres are a property of all complex sounds. What makes them sound different? Both instruments are playing a note with the same fundamental frequency, but each has its own unique timbre.Ī sound’s timbre gives our brains a lot of information about what it represents in the real world. Imagine a french horn and an electric guitar both playing the same A=440Hz note. Here’s a rough break down of where the common mix areas sit on the spectrum. Each element of your mix has energy in different parts of that range.ĮQ is the the tool you use to manipulate the frequency content of your mix so that everything is balanced and clear. Our ears can detect a huge range of frequencies-roughly 20 Hz to 20 kHz. What is EQ in music?ĮQ (or equalization) in music is the process of changing the balance of different frequency components in an audio signal. In this article I’ll go over everything you need to know to start using EQ like a pro-from the ground up. EQ is a powerful tool and you can easily do more harm than good. It’s so fundamental to the process that the majority of your time mixing music is probably spent tweaking EQ plugins.įor such a big topic, it’s important to have a firm grasp on the basics. EQ is a massive subject for audio engineers.
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