Last Updated 5 days ago
A shotgun microphone is a directional microphone that uses a slotted interference tube in front of its capsule to reduce some sound arriving from the sides. In film and television, it is commonly used for dialogue, interviews and selected sound effects. Crews often shorten the name to shotgun mic.
The term describes the microphone’s acoustic design. A boom mic describes a microphone positioned on a boom. A shotgun can be used on a boom, a stand or a camera, and a boom can carry another type of directional microphone. Keeping those meanings separate helps when choosing equipment for a particular scene.
How a Shotgun Microphone Works
Sound entering the tube from different directions travels different paths to the capsule. Those path differences cause partial cancellation of off-axis sound. The resulting pickup is more concentrated toward the front at frequencies where the tube is effective.
That response changes with frequency. At lower frequencies, the capsule’s own directional pattern becomes more important. A shotgun therefore does not hear through a perfectly narrow, uniform cone, and it does not eliminate everything beside or behind it. Polar diagrams at several frequencies are more informative than a single pickup-pattern label.
A longer tube can extend its useful directional effect to lower frequencies, but length also affects handling and placement. A longer microphone is not automatically the better choice for every shot. Listen to how the microphone sounds when the performer moves off its main axis, not just how strongly it rejects background noise.
Advertisement
Positioning It for Dialogue
Bring the microphone as close as the framing, blocking and safety of the setup allow, then aim it toward the speaking performer. Directionality can improve separation from unwanted sound; it does not make a distant voice sound as though it were recorded close up.
The boom operator follows changes in position and speaking direction while watching the frame and lighting. Mounting the same microphone on the camera may be convenient, but a wide camera position can leave it too far from the dialogue. The microphone should be placed for the sound, rather than assuming the camera position is also the best listening position.
Use a suitable shock mount and wind protection for the conditions. Keep the interference-tube openings unobstructed according to the manufacturer’s instructions. Confirm the microphone’s connection and power requirements before the take: XLR phantom power, battery power, plug-in power and USB arrangements vary by model.
Indoors, Outdoors and Reflections
Shotguns are often useful outdoors, where there may be fewer strong nearby reflections. Wind still needs to be controlled with an appropriate windscreen or blimp; a directional pickup pattern alone does not prevent wind noise.
In a small reflective room, sound can reach the microphone through several paths. Frequency-dependent off-axis pickup may color those reflections or make the voice change character as the microphone moves. A short supercardioid or hypercardioid microphone without an interference tube can sometimes give a more consistent result.
This is a comparison to test, not a rule that shotguns cannot be used indoors. Room treatment, distance, movement and the particular microphone all matter. Monitor the actual scene through headphones and compare placements before deciding.
A Practical Example
Two actors exchange a quiet line beside a parked car. The camera starts in a wide two-shot and then moves into close coverage. A camera-mounted shotgun stays several metres away during the wide shot, so increasing the recording gain also raises traffic and other background sound.
For the close coverage, the sound team can bring a boom-mounted microphone near the speaker while keeping it above the frame. For the wide, they may need another placement or a body-worn microphone. Changing the shot does not change the shotgun’s fundamental limitations: distance, aiming and the surrounding sound still determine whether the recording is usable.
Common Questions
Does a shotgun microphone zoom in on sound?
No. It reduces certain off-axis sounds relative to sound in front. It cannot recover a clean close recording simply by being pointed at a very distant person.
Is it always better than a lavalier?
No. A lavalier can stay close to a moving performer when a boom cannot, while a well-positioned boom can avoid clothing noise. Production sound decisions often combine both methods.
Can every directional microphone be called a shotgun?
No. Directional capsules also work without interference tubes. The tube is the distinguishing feature, rather than the presence of a boom pole or an elongated windscreen.
Advertisement
Related Terms
- Boom Mic A microphone positioned on a boom for production sound.
- Boom Pole The support used to place a microphone near performers.
- Boom Operator The crew member who positions and cues the boom microphone.
- Blimp A microphone wind-protection housing, in its sound-recording meaning.
- Lavalier A small microphone worn or concealed on a performer.