Feedback Suppressors

feedback suppressor: Manufactures, Types, Features & Applications

Introduction

A feedback suppressor is a device used to prevent feedback in sound reinforcement systems. Feedback occurs when a sound loop is created between a microphone or an instrument and a speaker, resulting in a loud and high-pitched tone. Feedback can be a significant problem in live sound applications, and it can be difficult to control without the use of a feedback suppressor.

 

Feedback suppressors work by analyzing the audio signal and detecting any frequencies that are in danger of causing feedback. They then apply a notch filter to reduce or eliminate those frequencies, without affecting the overall sound quality. This process is typically done in real-time, allowing the feedback suppressor to quickly and effectively respond to any changes in the audio signal.

 

Feedback suppressors are commonly used in live sound reinforcement applications such as concerts, conferences, and worship services. They can be particularly useful in situations where multiple microphones are being used, or when speakers are placed close to microphones or instruments.

 

There are two main types of feedback suppressors: hardware-based and software-based. Hardware-based feedback suppressors are standalone devices that can be inserted into an audio signal chain. Software-based feedback suppressors are typically plug-ins that are installed on a computer or digital signal processor.

 

Also, feedback suppressors can be connected to various audio equipment, including DI boxes, audio matrix/zone mixers, audio equalizers, audio signal processors, and amplifiers, in several ways depending on the specific equipment and application. It’s important to follow the manufacturer’s instructions and ensure that all connections are properly made to avoid any issues with feedback or other audio problems.

 

Overall, feedback suppressors are an essential tool for any sound engineer or musician who wants to prevent feedback and ensure high-quality sound in live sound applications. 

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History

Feedback suppressors have been in use since the early days of sound reinforcement systems when feedback was a common and frustrating problem. The first feedback suppressors were simple notch filters that were manually adjusted by sound engineers to eliminate feedback frequencies.

 

In the 1960s, automatic feedback suppressors were developed that used analog filters and audio detectors to automatically adjust the notch filters and prevent feedback. These early feedback suppressors were effective, but they were also complex and expensive, and they required a high level of expertise to use.

 

In the 1980s, digital signal processing (DSP) technology began to revolutionize the audio industry, and feedback suppressors were among the first applications of this technology. Digital feedback suppressors were able to offer more precise and effective feedback elimination, as well as more flexible and user-friendly controls.

 

Today, feedback suppressors are widely used in live sound applications, and they are available in a variety of hardware and software formats. Modern feedback suppressors can be very precise and effective, using advanced algorithms and filters to identify and eliminate feedback frequencies in real time.

 

Overall, the development of feedback suppressors has been driven by the need to eliminate feedback and improve sound quality in live sound reinforcement systems. While the technology has evolved over time, the basic goal of preventing feedback remains the same, and feedback suppressors continue to be an important tool for sound engineers and musicians.

Classifications

 

Feedback suppressors are devices that are used to eliminate or reduce feedback in sound systems. There are different types of feedback suppressors, and they can be classified based on various criteria. Here are some classifications of feedback suppressors:

 

1. Analog vs. Digital Feedback Suppressors: Analog feedback suppressors use hardware circuits to detect and eliminate feedback, while digital feedback suppressors use digital signal processing algorithms to achieve the same goal.
2. Single-Channel vs. Multi-Channel Feedback Suppressors: Single-channel feedback suppressors are designed to suppress feedback in one channel of a sound system, while multi-channel feedback suppressors can handle multiple channels simultaneously.
3. Parametric vs. Graphic Feedback Suppressors: Parametric feedback suppressors use parametric equalizers to adjust the frequency response of a sound system, while graphic feedback suppressors use fixed frequency bands to achieve the same goal.
4. Automatic vs. Manual Feedback Suppressors: Automatic feedback suppressors use algorithms to detect and eliminate feedback automatically, while manual feedback suppressors require the user to adjust the settings manually to suppress feedback.
5. Hardware vs. Software Feedback Suppressors: Hardware feedback suppressors are standalone devices that are typically placed in a sound system signal chain, while software feedback suppressors are computer programs that can be used with digital audio workstations or other software-based sound systems.

 

These are just a few examples of how feedback suppressors can be classified. The type of feedback suppressor that is best for a particular sound system will depend on various factors, such as the size and complexity of the system, the type of music or sound being produced, and the level of control required by the user.

Features

Feedback suppressors are designed to eliminate or reduce feedback in sound systems, and they come with various features that help achieve this goal. Here are some of the features you may find in feedback suppressors:

 

1. Frequency Detection: Feedback suppressors typically include a frequency detection system that can identify the frequencies that are causing feedback in a sound system. This can be done automatically or manually, depending on the feedback suppressor.
2. Filter Types: Feedback suppressors may include different types of filters, such as parametric, notch, and bandpass filters, to eliminate feedback. Parametric filters allow you to adjust the center frequency, bandwidth, and gain of each filter band, while notch filters eliminate a specific frequency range. Bandpass filters allow you to isolate specific frequency ranges.
3. Control Options: Feedback suppressors may offer different control options, such as automatic, manual, and semi-automatic modes. Automatic mode allows the feedback suppressor to adjust settings automatically, while manual mode allows the user to adjust settings manually. Semi-automatic mode combines both modes and allows the user to adjust some settings while the feedback suppressor handles the rest.
4. Input and Output Connections: Feedback suppressors typically have input and output connections that allow you to connect them to your sound system. Some feedback suppressors may also include additional connections, such as MIDI or USB connections, for added functionality.
5. Feedback Elimination Speed: Feedback suppressors differ in how fast they can eliminate feedback. Some models can eliminate feedback within milliseconds, while others may take several seconds.
6. Display: Feedback suppressors may include an LCD or LED display that shows you the current settings, frequency bands, and feedback levels. This can help you monitor and adjust the feedback suppressor more easily.
7. Presets: Some feedback suppressors may include preset configurations that are optimized for specific sound systems, venues, or music genres. This can make it easier to set up the feedback suppressor and achieve the best possible results.

 

These are some of the common features you may find in feedback suppressors. The features that are most important for your sound system will depend on your specific needs and preferences.

Advantages

Feedback suppressors offer several advantages for sound systems, including:

 

1. Improved Sound Quality: Feedback suppressors eliminate or reduce feedback, which can significantly improve the sound quality of a sound system. This means that you can enjoy clearer and more natural sounds without any annoying feedback noises.
2. Increased Volume: Feedback suppressors allow you to increase the volume of a sound system without worrying about feedback. This means that you can achieve higher volumes without compromising sound quality or risking equipment damage.
3. Increased Stability: Feedback suppressors can help to stabilize a sound system by preventing feedback from causing instability or damage to the equipment. This means that you can use your sound system with confidence, knowing that it will perform reliably and consistently.
4. Easy to Use: Feedback suppressors are typically easy to use and require minimal setup. This means that even users with little technical knowledge can set up and use a feedback suppressor effectively.
5. Saves Time and Effort: Feedback suppressors can save time and effort by eliminating the need for manual adjustment of the sound system to prevent feedback. This means that you can spend more time focusing on your performance or enjoying your music, rather than troubleshooting feedback issues.
6. Versatile: Feedback suppressors are versatile and can be used in a wide range of sound systems, including live performances, studio recordings, and home audio setups.

 

Overall, feedback suppressors offer several benefits that can improve the performance and quality of a sound system. Whether you are a professional musician or simply enjoy listening to music at home, a feedback suppressor can help you achieve better sound quality and a more enjoyable listening experience.

Manufacturers

There are several manufacturers of feedback suppressors, and some of the most well-known brands include:

1. Behringer: Behringer produces a range of audio equipment, including feedback suppressors. Their products are known for their affordability and ease of use.
2. DBX: DBX is a brand that specializes in professional audio equipment, including feedback suppressors. Their products are known for their high quality and reliability.
3. Shure: Shure is a brand that produces a range of audio equipment, including microphones and feedback suppressors. Their products are known for their durability and high performance.
4. Sabine: Sabine is a brand that specializes in feedback suppression technology. Their products are designed to provide effective and reliable feedback suppression in a range of sound systems.
5. Yamaha: Yamaha produces a range of audio equipment, including feedback suppressors. Their products are known for their high quality and innovative features.
6. TC Electronic: TC Electronic is a brand that produces a range of audio equipment, including feedback suppressors. Their products are known for their advanced digital processing and high performance.

 

These are just a few examples of the manufacturers of feedback suppressors. When choosing a feedback suppressor, it is important to consider the specific features and capabilities that you need, as well as the reputation and reliability of the manufacturer.

 

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FAQs

Q1. Can a feedback suppressor completely eliminate feedback?

While a feedback suppressor can greatly reduce feedback, it may not completely eliminate it in all cases. Factors such as room acoustics and the proximity of the microphone to the speakers can affect the effectiveness of a feedback suppressor.

 

Q2. What types of sound systems can benefit from a feedback suppressor?

Any sound system that uses microphones and speakers can benefit from a feedback suppressor. This includes live performance systems, recording studios, and home audio setups.

 

Q3. Are there different types of feedback suppressors?

Yes, there are different types of feedback suppressors, including automatic and manual models, as well as models with different types of filters and control options.

 

Q4. How do I choose the right feedback suppressor for my sound system?

When choosing a feedback suppressor, consider the specific features and capabilities that you need, as well as the size and type of your sound system. It is also important to choose a reputable manufacturer with a history of producing high-quality audio equipment.