How to Use EQ to Manage Feedback

Understanding EQ and Its Role in Feedback Control: Equalization (EQ) is the process of adjusting the frequency balance of an audio signal. In the context of feedback control, EQ allows engineers to remove or reduce problematic frequencies where feedback is most likely to occur. Step-by-Step EQ Process: Identify the Feedback Frequency: Use an RTA (Real-Time Analyzer) or a spectrum analyzer to locate frequency spikes that could cause feedback. Apply Narrow Cuts: Once identified, use a parametric EQ to apply narrow cuts at these frequencies. A notch filter can be particularly effective for targeting and removing feedback frequencies. Use High-Pass Filters: Apply high-pass filters to eliminate low-frequency rumble (below 100 Hz) that can contribute to feedback without affecting the quality of the audio signal. Preventive EQ Adjustments: Prevention is better than correction: When setting up a sound system, use EQ to preemptively address feedback-prone frequencies based on the room acoustics, mic placement, and gain levels.