Join Brian Lee White for an in-depth discussion in this video Using the bandwidth, or Q, EQ control, part of Audio Foundations: EQ and Filters.
We now know that EQ's frequency and gain controls can be used to shape a…signal's frequency content by boosting or cutting various ranges of frequencies,…but what defines the range of frequencies that these boost or cuts apply to?…When increasing or decreasing the gain control of an EQ, even though we select…a target or center frequency to work on, rarely is that the only frequency…that is affected.…For example, if I choose to boost a signal by 6 dBs at 2k, the frequencies around…2k also get boosted.…
The range or bandwidth of frequencies around the target frequency that the EQ's…gain control will affect is known as Q, short for quality.…In other words, Q is a way of expressing the frequency width of a filter in…relation to the center frequency of a specific filter band.…A boost or cut with a narrow or higher Q value will cause the EQ to affect fewer…frequencies around the target frequency, while a wider or lower Q value will…affect more frequencies around the target.…
Listen to this example of a 6 dB boost at 2.5k as I adjust the Q from narrow to wide.…
AuthorBrian Lee White
- Measuring frequency and amplitude
- Understanding the relationship between frequency and pitch
- Working with EQ controls such as bandwidth (Q) and gain
- Using graphic EQ
- Understanding the shelving and high-pass and low-pass filters
- Creating focus with EQ
- Creating complementary EQ curves
- Performing frequency bracketing with filters
- Automating EQ
- Using frequency analyzers
- Using harmonic generators to excite frequency content
Skill Level Appropriate for all
1. Understanding Frequency and Amplitude
2. Using Equalizers
3. Advanced EQ Topics
4. Additional EQ and Filtering Techniques
6. An Interview with the Author
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