Find the right mic for your action camera

Nov 11, 2025 Bengt-Olof Olsson

Most people who start using an action camera are quickly disappointed by the sound. It's almost inevitable. An external mic is a necessary upgrade for anyone serious about their films, as it immediately eliminates wind noise and captures the clear audio that the built-in microphone can only dream of.

Why you need an external mic for your action camera

An action camera is built to be a survivor – shockproof, waterproof, and incredibly compact. But there's a downside to this rugged design: audio quality is sacrificed. The built-in microphone is often trapped behind protective membranes or inside a waterproof housing, which inevitably muffles and distorts everything it records.

Imagine trying to photograph a grand landscape through a dirty window. Sure, you see what's out there, but the colors and details are gone. That's exactly how a built-in microphone works. It gives you a rough sketch of the sound but misses the clarity and depth that actually brings a video to life.

A person mounting an external microphone on an action camera.

The classic audio problems with built-in microphones

Built-in mics struggle with a few common issues that an external microphone solves instantly. First and foremost: wind noise. Even a light breeze can turn your soundtrack into a roaring chaos, making it impossible to hear a word of what's being said during a bike ride, on the ski slopes, or on a windy walk.

Furthermore, it's not designed to focus. It picks up absolutely everything around it – your breathing, the sound of your hands adjusting the camera, and all other unwanted background noise. This makes it almost impossible to capture clear dialogue or direct the audio pickup toward what you actually want to hear.

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Getting an external mic is the easiest and fastest way to elevate the production quality of your films. After all, sound is half the experience, and poor audio can ruin even the best-looking video.
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The immediate difference with an external mic

When you plug in an external microphone, you bypass all the physical limitations of the camera's built-in system. An external mic is designed with a single purpose: to capture audio with the highest possible quality. The result is noticed immediately.

\nCrystal-clear dialogue: You can place the microphone closer to the person speaking, which isolates the voice and makes it sharp and clear.
\nLess wind noise: Many external microphones come with windscreens (often called "deadcats" or "wind muffs") that effectively block wind and give you clean audio.
\nRicher sound: The audio gains a completely different depth and dynamic that makes the entire video feel more professional and engaging.

By upgrading the mic, you simply take control of the audio and ensure it matches the high standard of your video.

Okay, so you've decided that an external mic is the way forward. Great choice! But now you face the next challenge: which type should you choose? Names like Lavalier, shotgun, and wireless systems pop up, and it's easy to feel a bit lost.

Relax, it's simpler than it sounds. Think of microphones like different lenses for your camera. Each type has its superpowers and is built for a specific purpose.

Choosing the wrong mic is a bit like trying to photograph a bird from a hundred meters away with a wide-angle lens. Sure, you capture something, but it won't be at all what you intended. Let's break down the concepts so you can choose the right tool for your specific films.

A person choosing between different microphones for their action camera.

Lavalier microphones: For crystal-clear speech

A Lavalier microphone, often called a lapel mic, is that small, discreet microphone you attach directly to your clothing. Its absolute greatest advantage is its proximity to the sound source – meaning the mouth.

By being so close, it captures the voice with incredible clarity and effectively isolates it from distracting surrounding noise. Perfect for vlogs, interviews, or instructional videos where dialogue is key. Think of it as the portrait lens of audio; it puts the focus on the main subject and lets the background become soft and out of focus.

Shotgun microphones: For audio where you point

A shotgun microphone is designed to sit directly on your camera or rig. The name really says it all – it is highly directional and picks up sound directly in front of the camera while ignoring much of the sound from the sides and rear.

This type is your best friend when you want to capture the sound of what you are filming, not yourself huffing behind the camera. Filming a motorcycle passing by, a roaring waterfall, or a concert? Then a shotgun microphone is spot on. It works like a telephoto lens for audio – it zooms in on the sound source you point toward.

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A good rule of thumb is to match the microphone's "field of view" with the camera's frame. A shotgun mic helps you capture sound from what is in the shot, creating a more cohesive and professional experience for the viewer.
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Wireless systems: For total freedom of movement

Sometimes you need both the focused sound of a lapel mic and total freedom of movement. That's when wireless systems step onto the stage. They consist of a transmitter (worn by you or your interviewee) and a receiver that plugs into the camera. No wires, no limitations.

This freedom is worth its weight in gold for dynamic activities. Think sports, workout videos, or situations where you need to be far from the camera but still have perfect audio. For those who want to dive deeper, there is an excellent guide on wireless lapel microphones covering everything you need to know. See the wireless system as a drone for audio – you can capture fantastic sound regardless of where the camera is placed.

To make the choice even easier, we've put together a quick overview. Here you can directly compare the different microphone types and see which one best fits your needs.

Comparison of microphone types for action cameras

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Microphone Type	Best For	Pros	Cons
Lavalier (lapel)	Vlogs, interviews, instructional videos	Crystal-clear speech, discreet, isolates voice	Wire can be in the way, best for one person
Shotgun	Action scenes, events, nature	Directional audio, dampens interference, mounts on camera	Picks up everything in front of camera, less ideal for speech
Wireless system	Sports, fitness, dynamic scenes	Total freedom of movement, high audio quality, flexible	Requires batteries, more expensive, more parts to track

This table provides a good starting point. Consider what you most often film – is it you talking, an event in front of you, or do you need to be able to move freely? The answer to that question will lead you right through the microphone jungle.

How a microphone's polar pattern works

Terms like cardioid, supercardioid, and omnidirectional might sound like Greek to you, but they are actually the key to understanding how your mic ”listens.” Grasping these concepts is like a photographer choosing the right lens – it simply determines what ends up in focus.

Essentially, the polar pattern (or pickup pattern) describes where the microphone picks up sound from. Is it built to capture the entire surrounding atmosphere, or should it zoom in on a single sound source directly in front? The answer to that question shapes your entire audio recording.

Omnidirectional – for the whole soundscape

An omnidirectional microphone does exactly what the name suggests – it picks up sound from all directions. Imagine a bare light bulb illuminating an entire room evenly in 360 degrees. This type of microphone works exactly the same way, but with sound.

It is perfect when you want to capture the total atmosphere.

\nWhen should you use it? To record ambient sounds in nature, capture the chatter of a group of people, or document an entire event where sound comes from all directions.
\nCommon microphone type: Many lavalier microphones (lapel mics) are omnidirectional. This is clever because it doesn't matter as much if it's not perfectly aimed at the mouth – it still captures the voice clearly.

The downside? In noisy environments, it becomes your enemy. Because it picks up everything, you get every single distracting background noise.

Cardioid – for focused sound

A cardioid microphone has a heart-shaped pickup pattern (the name comes from the Greek kardia for heart). It is super sensitive to sound directly from the front, less sensitive from the sides, and almost completely deaf to sound coming from behind.

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Returning to the light analogy, the cardioid microphone is like a flashlight. You point it at what you want to illuminate with sound, and everything else falls into the shadows. Perfect for isolating a voice or a specific sound effect.
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This makes the cardioid pattern extremely useful for action cameras. Shotgun microphones, which are often mounted on top of the camera, are almost always of this type. It captures the sound of what you are filming and simultaneously helps tone down the sound of yourself behind the camera.

This type of focused technology, by the way, is not unique to audio. Sweden is a leading nation in digital innovation, where similar principles of precision are applied in everything from industry to everyday technology. An interesting example is microchip implants, where approximately 3,500 Swedes were already using the technology in 2018 for everything from payments to opening doors. You can read more about how Sweden is at the forefront of digitalization on regionstockholm.se (in Swedish).

Choosing the right pattern is absolutely crucial. An omnidirectional microphone on a windy mountaintop will catch wind noise from all directions, while a cardioid microphone can be pointed away from the worst wind to save your audio recording.

Connections and adapters you must know about

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A great microphone is completely useless if you can't plug it in. Navigating the jungle of connectors and adapters can feel overwhelming, but it is vital for getting your gear to work together. Without the right connection, you risk coming home with perfect video but no sound at all. Silent films are rarely fun.

The most common connector you'll encounter is the classic 3.5 mm jack. But there's a common trap here that many fall into. There are actually two versions that look almost identical: TRS and TRRS.

TRS vs. TRRS – a small detail with enormous significance

The difference is actually quite simple once you know what to look for. A TRS plug has two black rings and is standard for cameras and audio recorders. A TRRS plug has three black rings and is made for smartphones, where the extra ring handles the microphone signal from a headset.

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Using the wrong type of cable is one of the most common mistakes. If you plug a TRRS microphone directly into a camera adapter that expects TRS, it simply won't recognize the audio signal. The result? Total silence.
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This isn't just a technical detail; it is fundamental for your microphone to actually record any sound at all. Always check what type of connector your microphone and adapter have.

USB-C and brand-specific adapters

While the 3.5 mm jack is a universal standard, many action camera manufacturers like GoPro and DJI choose to use the USB-C port for both charging and audio input. This keeps the camera compact and weather-sealed but creates an extra step for you – you must have a specific adapter.

For GoPro users, the official GoPro Pro 3.5mm Mic Adapter is a must. Many have tried to save a few bucks on cheaper copies, only to find they don't work reliably. The original adapter contains a special chip that the camera needs to identify an external microphone. Read more and find the right GoPro microphone adapter for your model on ActionKing.se to avoid future headaches.

Understanding these connections is just as important as knowing the microphone's polar pattern, as this image illustrates well.

Infographic about mic

The infographic shows how omnidirectional microphones capture sound from all directions, while cardioid and supercardioid focus the sound pickup forward.

A quick compatibility checklist

Before you buy a new microphone, go through this checklist to make sure everything will work together:

\nWhat connection does my camera have? (Usually USB-C on newer models).
\nDo I need an official adapter from the manufacturer? (For GoPro, the answer is almost always yes).
\nWhat connector does the microphone have? (TRS or TRRS?).
\nDo I need an adapter cable between TRS and TRRS? (If the microphone and camera adapter don't match).

By double-checking these points, you'll save both time and a lot of frustration. A working connection is the invisible hero that ensures your nice microphone can deliver that great sound you're after.

Mounting and placing your mic for the best sound

A person carefully attaching a microphone with a windscreen to a helmet. \nHaving a great mic is only half the battle. Where you place it is just as important for the end result – sometimes even more so. A perfectly placed budget microphone will almost always beat an expensive pro mic that's sitting in the completely wrong spot.

The basic rule is actually dead simple: place the microphone as close to the sound source as possible. Whether the source is your voice, a rumbling engine, or birdsong, proximity provides a clearer and richer sound. At the same time, you shut out distracting background noise. This is where you move from just owning gear to actually thinking like an audio engineer.

Mounting a lapel mic for razor-sharp dialogue

Lavalier microphones, or "lapel mics," are designed to be attached to clothing to capture speech. But sloppy placement can ruin the entire recording with annoying rustling sounds from the fabric.

\nOptimal placement: Clip the mic onto the chest, about a hand's width below the chin. There, it captures the voice clearly without picking up "plosive" sounds from breathing.
\nAvoid rustling: Ensure the microphone isn't resting directly against a layer of fabric that might rub against it. Use the clip to create a small distance, or tape the cable to the inside of the shirt so it can't move and create noise.

Get the most out of your shotgun microphone

A shotgun microphone is usually mounted directly on the camera or a helmet using a cold shoe mount. Because it is highly directional, it is crucial that it points exactly toward what you want to record. If it aims even slightly off, the sound will be thin and distant.

The precision here is reminiscent of other smart technologies where accuracy is everything. Take pet ID tagging as an example, where a small microchip is placed under the skin. The technology is incredibly reliable – studies show that about three out of four dogs with microchips are reunited with their owners. Read more about how ID tagging with microchips works at SVERAK.se (in Swedish).

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Think of your shotgun mic as a beam of sound. You must aim exactly where the sound is coming from to capture it with full impact. If you're filming yourself talking, make sure the camera and microphone are angled directly at your face.
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Tame the wind with a windscreen

For anyone filming outdoors, wind is audio's worst enemy. That roaring noise can drown out everything else and render the entire clip useless. The solution is a windscreen, often called a "dead cat" due to its furry appearance.

This furry sock is slipped over the microphone, and its long fibers effectively break up wind gusts before they reach the microphone's sensitive membrane. The difference is night and day. For activities like skiing, cycling, or recording at the coast, a high-quality microphone windscreen is absolutely indispensable for bringing usable audio home.

Common questions about microphones for action cameras

Even with all this information, you might still have a few remaining thoughts spinning around. That's perfectly normal. Here we've gathered and answered some of the most common questions to give you that final boost of confidence.

The goal is to quickly clear up those final question marks so you can leave uncertainty behind and start recording video with audio that truly impresses.

Do I really need an expensive microphone?

Absolutely not! One of the biggest myths is that good sound must cost a fortune. The truth is that a cleverly placed budget microphone often crushes the results from a sky-high priced pro mic used incorrectly.

Instead, focus on choosing the right type of mic for what you're filming – a lapel mic for clear dialogue, a shotgun to direct the sound. Then learn how to place it. A mid-range microphone that is correctly mounted and protected from the wind will give your films a massive lift without emptying your wallet.

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It's much more about technique than the price tag. Getting the microphone close to the sound source and protecting it from interference is 90% of the job for achieving professional audio.
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How do I eliminate wind noise most effectively?

There's really only one way that works properly: use a windscreen. A simple foam cover can help against light indoor drafts, but as soon as you step outside, a "deadcat" (a wind muff) is completely indispensable.

Those furry covers are designed to break apart wind gusts before they even reach the microphone's sensitive membrane. The difference is night and day and can be what determines whether a recording is usable or completely ruined by a roaring noise.

Does my phone microphone work with my GoPro?

Usually not directly, unfortunately. Most microphones made for phones have a TRRS plug (the one with three black rings), while action cameras and their adapters require a TRS plug (with two black rings).

If you plug a mobile microphone in directly, the camera will likely not detect any sound at all. But don't worry, the solution is simple: a small adapter cable that converts TRRS to TRS. Just make sure you have the right adapter in your bag before you head out.

What is the difference between an active and passive microphone?

Simply put: an active microphone needs its own power source to function, usually a small battery inside the microphone itself. This extra power allows it to boost the signal, which can provide a stronger and cleaner sound, especially over longer cables. Many wireless systems are based on active microphones.

A passive microphone, on the other hand, needs no power of its own. It is powered entirely by the tiny bit of current the camera sends out via the microphone input (sometimes called "plug-in power"). These are often simpler and more compact. For those who want a reliable and flexible solution without having to track extra batteries, a complete system like the BOYA BY-WM4 PRO-K1 wireless microphone system can be a stellar choice, as it provides a complete solution for both camera and mobile.

Explore the Nordic region's largest selection of accessories for your action camera at ActionKing. Find everything you need to take your recordings to the next level, from microphones and mounts to filters and batteries. Visit us at https://actionking.se and discover how the right gear can transform your films.

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