In mastering, equalization plays a crucial role in refining and polishing the final mix. Mastering engineers employ both global EQ and specific EQ to achieve a balanced and cohesive sound. Each approach has different practical applications and is used in different contexts depending on the needs of the mix.
Global EQ
Global EQ is applied to the entire mix in a uniform manner. Its purpose is to adjust the overall tonal balance and correct any problems affecting the entire mix. This type of EQ is especially useful when you need to make general adjustments to the sound, such as adding brightness to the high frequencies, increasing warmth in the low frequencies, or adjusting the mids for clarity.
A practical example of global EQ would be the use of a shelving curve to boost high frequencies from 10 kHz and above. This setting can add air and brightness to the mix, making it sound more open and detailed. Similarly, a shelving curve in the bass below 100 Hz can increase the depth and impact of the sound without affecting the mid and high frequencies.
Global EQ is ideal for correcting tonal imbalances that affect the mix as a whole. For example, if a mix sounds dull and lifeless, a slight boost in the 3 kHz to 5 kHz range can restore clarity and presence. This type of adjustment is done sparingly to avoid over-processing the mix and to maintain the naturalness of the original sound.
Specific EQ
Specific EQ focuses on particular areas of the mix that need special attention. This type of EQ is used to address specific problems, such as unwanted resonances, annoying frequencies, or to enhance specific elements without affecting the rest of the mix. Specific EQ allows for more precise and detailed adjustments, ensuring that only problematic or desired frequencies are modified.
A practical application of specific EQ is the use of a bell curve with a narrow Q to attenuate an annoying resonance around 200 Hz. This type of resonance can make the mix sound “boomy” or muddy, and attenuating it improves clarity and tonal balance. Another application is to boost a narrow band around 1 kHz to 2 kHz to give more presence and definition to the mix without adding harshness.
Specific EQ is also useful for adjusting individual elements within the mix. For example, if the lead vocal needs more presence, specific EQ can be used to boost frequencies between 2 kHz and 4 kHz, where vocal clarity is found, without affecting the rest of the mix. This type of adjustment allows you to highlight important elements and ensure that they integrate harmoniously into the overall context of the mix.
Combined Applications
In practice, mastering engineers often combine global EQ and specific EQ to achieve the best results. For example, they may start with global adjustments to establish an overall tonal balance, and then use specific EQ to fine-tune details and solve specific problems. This approach allows precise control and detailed refinement, ensuring that the final mix is clear, balanced and professional.
In a mastering session, the engineer can begin by applying global EQ to adjust the overall tonal character of the mix, ensuring that it sounds balanced at all frequencies. Once the desired tonal balance is achieved, the engineer can identify and address specific problems with detailed EQ, such as attenuating resonant frequencies or enhancing elements that need more presence.
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Practical Example
Imagine a mix that sounds a bit dull and lacks overall clarity. The mastering engineer can apply a global EQ to boost the high frequencies with a shelving curve starting at 10 kHz. This setting adds the necessary brightness, making the mix sound more open and detailed. However, after this setting, an annoying resonance is noticeable around 250 Hz. The engineer then uses a specific EQ with a bell curve and a narrow Q to attenuate that frequency, eliminating the resonance without affecting the rest of the mix.
In addition, if the lead vocal needs to stand out more, a dedicated EQ can be used to boost frequencies between 2 kHz and 4 kHz, adding presence without interfering with other elements. These combined settings ensure that the mix not only sounds balanced and bright, but also clear and free of problematic resonances.