What is a Boom Mic? Exploring its Uses and Benefits

A boom microphone is attached to the end of a boom pole, allowing it to be positioned close to a sound source without being visible in the frame.

This makes boom mics essential tools for film and video production, where capturing clear and high-quality audio is crucial while maintaining the visual integrity of the scene. Although often referred to as “boom mics,” these devices are typically shotgun microphones, which are highly directional and designed to reject off-axis background noises.

Boom mics, also known as pro mics or extended range mics, have a short and narrow range of motion, making them ideal for placement above camera operators in the “boom” position.

They primarily utilize hyper or super-cardioid capsules and interference tubes to maintain their directionality and reduce the chances of capturing unwanted sounds. By allowing precise audio capture in challenging environments, boom microphones have become the go-to choice for various film and video applications.

Table of Contents

a close-up of a microphone

What is a Boom Mic?

A boom mic, or boom microphone, is any microphone connected to a boom, a platform designed for holding microphones or similar equipment without using hands. Typically, these microphones have highly directional polar patterns and are mounted on boom poles or arms to capture audio from a distance while rejecting off-axis background noise.

Boom mics are often shotgun microphones, which are highly directional, featuring hyper or supercardioid capsules and interference tubes. However, it’s important to note that not all boom mics are shotgun mics, and they have more applications than just boom miking.

The primary purpose of using a boom mic is to capture audio when close miking is impractical but desired. This type of microphone setup is commonly used in various applications, such as film production, video recording, and podcasting.

By mounting the microphone on a boom pole or arm, it allows for precise positioning and the ability to follow the movement of subjects while maintaining a consistent audio recording.

Types of Boom Mics

Boom microphones are primarily known for their use in film and television production. These microphones are mounted or attached to a pole or arm, allowing them to be positioned near the subject that needs to be recorded while remaining out of the camera’s frame.

Different types of boom mics are available, each designed for specific applications and performance requirements.

The first type is the shotgun microphone, commonly used as a boom mic because of its highly directional polar pattern.

This design helps to reject off-axis background noise and focuses on capturing the sound from the subject in front of the mic. Shotgun microphones are often attached to a boom pole, enabling them to be positioned precisely to achieve the desired audio quality. Examples of shotgun microphones include the Sennheiser MKH416 and Rode NTG3.

Another type of boom microphone is the small diaphragm condenser microphone.

These mics are known for their fast transient response, wide frequency range, and detail retrieval. Small diaphragm condensers are versatile, making them suitable for various applications, including capturing dialogues, sound effects, or ambiance. They are also favorable for indoor recordings where the room’s acoustics and reverb can enhance the captured sound.

Lastly, there is the large diaphragm condenser microphone. While not as common in boom operation due to size and weight, these microphones offer excellent sound quality and a smooth, natural frequency response. Large-diaphragm condensers can be used in applications where detailed sound capture and a sense of airiness are essential, such as voiceovers, foley, and music recording.

In summary, boom microphones come in various forms, with each type offering unique characteristics and performance features that cater to different production needs. Choosing the right boom mic will ensure the best sound quality and optimal results for your project.

How to Use a Boom Mic

A boom microphone, commonly known as a boom mic, is a type of microphone usually mounted on a boom pole and positioned above or below the subjects in a video or film production. It’s designed to capture clear and high-quality audio while remaining out of the frame.

Here are some guidelines on how to use a boom mic effectively:

First, it’s essential to hold the boom mic near the sound source as possible without risking it appearing in the frame. The aim is to achieve the best audio quality while maintaining the visual aesthetics of the video or film. While positioning the boom mic, ensure it’s pointing at the sound source.

This usually means angling the mic toward the actors’ mouths or the point of interest in a scene.

Next, a boom mic operator needs to be very dynamic during a film shoot, especially if the actors are moving or the shoot occurs outdoors. In such scenarios, it’s crucial for the operator to keep the mic in the right position continuously to ensure consistent audio quality.

If the speaker’s head moves or the scene involves movement, the operator must follow the action and reposition the mic accordingly.

Additionally, mastering the technique of operating a boom mic requires intimate knowledge of both the equipment and the proper etiquette on set. Familiarize yourself with the microphone’s pickup pattern and sensitivity to understand how it interacts with the surrounding environment.

Also, communication is key when working as a boom operator. Always listen to the director and other crew members and be aware of your surroundings for your safety and the production’s success.

Finally, take breaks and stretch when you can if you’re the boom operator responsible for holding the microphone in position. Operating a boom mic can be physically demanding, so taking care of yourself to remain focused and energetic throughout the shoot is important.

Boom Mic Advantages and Disadvantages

A boom mic, typically mounted on a boom pole or stand, offers key advantages in capturing audio for various applications but also carries some drawbacks that need consideration.


  • Mobility: Boom mics, especially when mounted on a pole, provide mobility that allows capturing sound from various angles, following actors’ movements, and making adjustments on the go.
  • Consistency: A boom mic can help maintain consistent audio levels by staying in an optimal position as the user moves.
  • Directionality: Boom mics, combined with shotgun mics, offer a highly directional sound capturing, focusing on the subject while rejecting background noise.


  • Damage risk: Boom mics, especially those with boom arms, can be susceptible to damage from handling or accidental bumps, potentially rendering the headset useless.
  • Cost: When comparing boom mics to inline microphones, boom mics and their additional equipment can be more expensive.
  • Longer cabling: Boom mics require longer cables due to the extended length of the boom stand or pole. This may pose complications for setup and mobility.

Boom Microphone Applications in Film and Broadcasting

A boom microphone, often called a shotgun microphone, is a critical tool in the film and broadcasting industry. It is typically attached to a boom pole, positioning it close to the subject’s mouth while staying out of the camera’s frame.

One of the primary applications of a boom mic is to capture clear and high-quality audio during indoor and outdoor shoots.

In film and television projects, a boom mic operator manages the boom mic kit, chooses the optimal microphone position, and sometimes uses additional microphones, like lapel microphones, to enhance the audio quality.

Boom mic operators must be dynamic, particularly during outdoor shots, as they must follow the actor’s movements and maintain the microphone in the right position for consistent sound.

Boom microphones are also utilized in broadcasting and live events for various purposes. For instance, they can capture on-field audio during sports events or record interviews in noisy environments.

Shotgun microphones’ directional nature helps focus on the desired sound source and reduce background noise, ensuring clear audio capture in different situations.

Overall, boom microphones are essential tools in the film and broadcasting industry, enabling high-quality audio capture in diverse scenarios. Their versatility and ability to isolate the desired sound source while minimizing background noise make them ideal for professional and amateur productions.

Choosing the Right Boom Mic

When selecting the perfect boom mic for your needs, consider factors like the microphone’s polar pattern, sensitivity, and the environment in which it’ll be used. These factors will help ensure you capture clear and high-quality audio for your projects.

Polar Pattern of Boom Mic

First, evaluate the polar pattern of the boom mic, which refers to how the mic picks up sound from various directions. A common polar pattern for boom mics is the super-cardioid or hyper-cardioid, which effectively captures sound from the front while minimizing unwanted noise from the sides and rear.

This is particularly useful for video or film production, where capturing specific sounds without too much ambient noise is crucial.

Sensitivity of Boom Mic

Next, consider the boom mic’s sensitivity, which indicates how well the mic responds to various sound pressure levels. A mic with higher sensitivity will be better at picking up quieter sounds, while one with lower sensitivity is ideal for louder environments. It’s essential to strike the right balance to capture quality audio without distortion or excessive background noise.

The environment of the Boom Mic

Lastly, consider the environment in which the boom mic will be used. If you primarily use the boom mic indoors, you might not need a shotgun mic with extreme directivity. Conversely, outdoor recordings typically call for a more directional microphone, like a shotgun mic, to minimize wind and other environmental noise.

Final Thoughts on Boom Mics

In conclusion, finding the perfect boom mic is a matter of considering its polar pattern, sensitivity, and intended use. By considering these factors, you’ll be well-prepared to capture clear, high-quality audio for your projects.

Juan Louder
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Juan Louder

I started SoundStudioMagic to learn how to record my own audiobook at home, and now I'm addicted to all the latest techniques and gear.

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