What Is a Feedback Suppressor?

What Is a Feedback Suppressor?

Feedback Suppressor

A Feedback Suppressor is a device used in live sound reinforcement systems. It prevents audio feedback by processing signal waves in the signal path. Some types of feedback suppressors are built into headphones. Here is a look at some of the most popular feedback suppressors. Read on to learn about these products and how to find the right one for you. Alternatively, you can check out my review of Bosch Plena and DBX AFS2.

Automatic Feedback Suppression

A Feedback Suppressor can be a great tool in the battle against annoying sound-quality feedback. The Automatic Feedback Suppression algorithm monitors incoming audio for feedback, then places narrow notch filters at each of its frequencies to reduce the gain. These filters have pinpoint precision, carving out offending frequencies while preserving the rest of the frequency spectrum and overall sound quality. This process only takes milliseconds, and it’s effective enough to stop unwanted noises before the human ear can notice them.

When engaged, the Feedback Suppressor automatically adjusts the filters to minimize the amount of sound feedback. The FBS uses eight bands to filter the audio signals. The automatic mixer tracks the position of the microphone to eliminate feedback. The FBS can also detect feedback frequencies and suppress them without sacrificing sound quality. Bypass will eliminate feedback in some situations, but keep the fixed and detected filters. Moreover, the automatic mixer can switch between fast and slow modes.

Sound engineers commonly use notch filters and parametric equalization to control feedback in a sound reinforcement system. Automatic feedback suppression uses a speculative placement of a notch filter that listens for the onset of feedback and inserts a notch filter at the frequency of the feedback detected. The advantage of this technique is that it does not color the sound until the system is at risk of feedback. The advantages of this technique include less impact on the sound and no need to hire a professional to fix the problem.

The FBQ1000 Feedback Destroyer is one of the fastest feedback suppressors on the market, with a response time of 0.2 seconds. It has an ultra-fast algorithm to identify feedback frequencies, and sets narrow notch filters to suppress these unwanted frequencies while leaving the rest of the signal intact. It can be set up and operating in a matter of minutes, ensuring the quality of your music. This technology is also helpful for in-ear monitor users.

Methods of detecting feedback

There are many different ways to detect feedback suppression, but the main focus of this research is on how to detect the frequencies and suppress feedback. The feedback signal is typically a very loud narrow-band noise, and a feedback detector is placed within the signal path. The feedback detector will then react to similar signals in the environment. It can distinguish between feedback tones and other noises. Detecting feedback suppression is a very useful tool for analyzing feedback processes.

The audio system of the invention comprises a microphone, audio signal processing means, an output transducer, and means for detecting and counteracting feedback. The controller is adapted to detect feedback by altering the phase of the audio signal at a frequency. When a possible feedback tone is detected, the detecting unit compares the frequency of the audio signal with the frequency of the anti-feedback measurement. The frequency of the resulting signal is the same as the frequency of the potential feedback tone.

Sound engineers have used a variety of methods to detect feedback in recordings. One method, using parametric equalization, is automatic notch. This technique listens for the onset of feedback and inserts a notch filter at the frequency detected. Other methods, which are less invasive, include adaptive filtering and non-invasive harmonic analysis. The automatic notch technique has the advantage of preventing coloration of the signal until it is at risk of feedback.

Using automatic feedback suppression technology, this process is fast and easy. Using the technology properly requires practice and thorough sound checks. Using AFS technology, the process is complete in milliseconds, before the human ear is able to detect any abnormalities. This will help keep the focus on the performance. If you are unsure about the best technique for detecting feedback, use the Automatic Feedback Suppression technology.

One method involves measuring the relative strength of the different harmonics present in the input signal. This method is not completely objective, however, and may lead to inaccurate results. The method involves a temporary notch placed at the potential feedback frequency. This technique is intrusive, but it does not cause much harm. One way to detect feedback suppression is to apply an adaptive notch filter, which smoothes out the power ratio between error signal and microphone.


The DBX AFS2 Feedback Suppression System has been completely redesigned and built on the proven foundation of the AFS224. It includes an intuitive Wizard function and a redesigned Advanced Feedback Suppression module. Designed for optimum performance, it offers excellent value for money. This feedback suppressor is perfect for professional or home use and is a worthy addition to any sound system.

The AFS2 has 24 adjustable filters per channel and fights feedback transparently and efficiently. It also offers a range of presets, including Speech, Music, and Speech/Music. These presets allow for customized, precise tuning of the dbx AFS2 to meet the needs of any live sound system. The AFS2 is designed to fit any room. To avoid a costly sound system tune-up, this feedback suppressor is an excellent investment.

The dual-channel AFS2 is a high-quality feedback suppressor that offers advanced DSP technology. It provides a high-quality filter set for specific applications, including music low, music medium, and speech low. In addition, the AFS2 comes with input metering so you can see how well the dbx AFS2 is working. Once you get a feel for how the AFS2 works, you’ll never want to go back.

The dbx AFS2 is a multi-functional feedback suppressor that seamlessly integrates into any live sound rig. It can protect individual channels, instrument sections, main mix inserts, and the entire mix from unwanted feedback. Its multi-functionality allows it to combat feedback on stages across the world. Its easy-to-use design also makes it ideal for mobile audio setups.

The AFS2 is designed to provide professional sound quality in any room. It includes a fully-featured AFS2 wizard that takes the guesswork out of setting up any room. The software-based AFS2 feedback suppressor has a full LCD display, as well as menus and five-segment LEDs indicating filter settings. The AFS2 also includes a USB port for firmware updates. It ships with a standard IEC power cable.

Bosch Plena

The Bosch Plena feedback suppressor can dramatically reduce the volume of acoustic feedback, thanks to its automatic mixer and built-in adaptive filter. It can add up to 12dB of gain before feedback, and it works best on fixed microphone positions, such as a rostrum or pulpit. Unlike many other feedback suppressors, it can track the speaker so that the feedback margin is kept as high as possible.

The powerful DSP in the Plena feedback suppressor works in tandem with its patented algorithm to actively filter unwanted room reverberations. The suppressor detects the reverb component of the output signal and removes it before feedback occurs. The suppressor even includes a built-in phantom supply and balanced microphone input. The device also features a dereverberation algorithm and a five-hertz frequency shift.

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