Audio for a video shoot: mic basics

Your audience will forgive a soft picture. They will not forgive hiss, room echo and a lavalier that rubbed against a sweater all day: they leave before you reach the point, and most audio problems cannot be rescued in the edit. So here is how we pick microphones for a video shoot, what you can handle yourself, and when hiring a sound person is actually worth it.

Key takeaways

• Lavalier for interviews and talking heads, shotgun when the mic must stay out of frame, handheld reporter mic for noise and crowds.
• In a 2018 study by Eryn Newman and Norbert Schwarz, published in Science Communication, viewers rated the very same talk as less important and the speaker as less intelligent and less likeable once the audio quality was degraded. The content was identical.
• Research by Bild and colleagues, published in Law and Human Behavior in 2021, found that with poor audio people recalled fewer facts from a testimony and gave it less weight.
• Always record two audio tracks at once. One failure then does not kill the whole shooting day.
• Room echo and air conditioning hum cannot be removed in post. You fix them by choosing a different room, not by adding a plugin.
• A usable wireless lavalier kit costs roughly 100 to 400 euros. That is still cheaper than reshooting a single day.

Why do viewers forgive a soft image but not bad sound?

Because bad sound costs the viewer effort, and effort turns into distrust. When people have to decode what you are saying, they stop listening to what you are saying. That is exactly what Eryn Newman and Norbert Schwarz measured in their 2018 Science Communication study: degrading the audio on the same talk was enough for viewers to call the research less important and the speaker less intelligent and less likeable. Researchers call it processing fluency. We describe it more bluntly: people assume the whole thing was cheap, even when it was not.

You can test this on yourself. Think of the last corporate video you closed because the speaker sounded like they were in a bathroom. We see it at every event we cover: when the stage engineer hands us a clean feed from the mix, the interview flies. When we have to rely on a room mic instead, even a beautifully lit interview can end up unused. We wrote separately about the basics of lighting on a shoot, but if your budget only stretches to one of the two, buy sound first.

Which microphone fits which situation?

The short version: a lavalier takes the voice from close up, a shotgun takes it from a distance, and everything else is a compromise. Here is how it plays out on our shoots.

• Lavalier, ideally wireless. Interviews, talking heads, client testimonials, anything where a person sits or stands and talks. The level stays the same even when they move. Watch three things: hair, jewellery and a collar that rustles against it.
• Shotgun on a boom. When the mic must not appear in frame, or when you shoot scripted scenes and want a more natural, roomier sound. It needs an extra pair of hands holding it overhead and keeping it out of the shot.
• Handheld reporter mic. Vox pops at an event, noise, crowds, people who change every thirty seconds. It does not look elegant, but in noise it does what a lavalier cannot.
• Large diaphragm mic on a stand. Podcasts and long table conversations, where there is time to place the mics and nobody moves around.
• The camera mic. Backup and sync reference only. Never the main source for anything that represents your company.

If you want to hear the difference between a lavalier and a shotgun instead of reading about it, play this comparison. Two minutes and you will know what the fuss is about.

For the wider context behind the credibility study, USC published a readable summary of how audio quality affects credibility, including how the experiments were set up.

What can be fixed in the edit and what cannot?

You can fix levels, mild constant hiss, a few harsh sibilants and a short noise that can be covered. You cannot fix room echo, a clipped signal or a mic that sat in the wrong place all day. That is the line you will not cross in post production, whatever the software marketing promises.

The four that hurt us most in practice:

• Reverb in an empty room. Once the reflections are baked into the recording, they are in there as firmly as the voice itself.
• Clipping. If the signal hits the ceiling, that part of the wave simply does not exist. It cannot be recovered, only masked.
• Wind with no protection. A furry windshield costs a few euros. Outdoor audio recorded without one is often unusable.
• Clothing rustle. A lav under a shirt that brushes fabric with every breath sounds like someone unwrapping a biscuit. At that point your only tool is cutting around it.

Noise and reverb removal tools are far better than they were five years ago, we admit that. But every such pass also takes something away from the voice. After heavy denoising people sound like they are on a phone call, which is exactly the impression you were trying to avoid.

How do you test the sound five minutes before a shoot?

Listen back on headphones. That is the whole trick. Nine out of ten problems we see at companies would be caught by twenty seconds of test audio that somebody actually listened to. Here is the routine, no gear required:

1. Clap once in the middle of the room. If you hear a tail, the microphone hears it too. Carpet, curtains, bookshelves and full furniture all help. An empty glass meeting room is the worst spot in the building.
2. Turn off everything that hums. Air conditioning, fridge, projector, phone notifications. Your ear adapts to a hum in a minute, a microphone never does.
3. Record twenty seconds of normal speech and play it back on headphones, not through a phone speaker. A phone speaker makes unusable audio sound fine.
4. Check your levels. Normal speech around minus 12 dB, the loudest peaks no higher than minus 6 dB. Quiet and clean beats loud and clipped.
5. Check the distance. Lavalier about a hand width below the chin, shotgun as close above the head as the frame allows. Every doubling of distance adds more room to the recording.

If you take one thing from this article, take the headphones. It costs nothing and it saves most shoots.

When do you genuinely not need a sound person?

Often. And we say that even though video production is how we make a living. If you film one person in a quiet room, you can clip on a lavalier and you have twenty unhurried minutes, a dedicated sound operator is not worth the line item. The same goes for internal videos, short social clips and anything you could simply shoot again next week.

Call a sound person when there is only one take, or when the microphone count goes up. A conference with five speakers. An interview on a factory floor where the line cannot be stopped. An event where sound comes from the stage mix and the room at the same time. A shoot outdoors next to a road. In all of those, a sound person is insurance rather than luxury: you are paying for the day not to repeat itself.

Honestly, it has happened to us too. We lost an interview at an event because a lavalier transmitter dropped its link behind a concrete pillar. That is why we now also record a backup straight to a recorder on the speaker. Not elegant, but it has never let us down.

Frequently asked questions about audio on a video shoot

Is the phone microphone enough for a company video?

For a quick clip from a business trip, yes. For anything representing your company, no. A phone mic is built to pick up sound from every direction, so it picks up the whole room with you. An external lavalier under a hundred euros is the cheapest video quality upgrade you can buy.

How far from the mouth should the microphone be?

A lavalier roughly a hand width below the chin, so fifteen to twenty centimetres. A shotgun as close as the frame allows, ideally within a metre. The rule is simple: the further the mic, the more room and less voice you get.

Why does our meeting room sound like a bathroom?

Because the sound has nowhere to die. Glass, bare walls and an empty table reflect everything, so the mic records your voice plus all its reflections. Quick fixes: bring in plants, close the curtains, seat the person near a corner with a bookshelf, and never in the middle of an empty room.

Can we take event audio straight from the sound desk?

Yes, and it is almost always the best option. Ask the technicians for a feed from the mix, but keep recording a room mic at the same time. The mix gives you a clean speaker voice, the room gives you atmosphere and applause. Without the second track your video sounds dead.

If you are planning a shoot and cannot tell whether your space and gear will hold up, write to us. A description of the room and a few photos are enough for us to tell you what you can do yourself and what we would bring. You will find us on the contact page.