Field Recording: Portable Recorders, Stereo Microphones and Ambiences.

Recording outside the studio changes the rules: you cannot move the source, cannot repeat the scene, and the equipment works in an environment you do not control. Wind hits the capsule, the ground transmits handling through the support, and the scene lasts as long as it lasts. Field recording therefore revolves around a simple idea: prepare the equipment so what reaches the file is usable the first time.

This chapter covers portable recorders, stereo microphones, wind protection, handling noise and capturing ambiences.

What You Need to Record Outside

The minimum kit consists of a recorder with manual level control, wind protection, a shock-mounted support and closed-back headphones. Headphones are not just a convenient accessory: they are your only meter in the field. If you cannot hear the problem, you cannot correct it in time, and the recording cannot be repeated.

Before leaving, decide two things: what you want to capture—a particular source in detail or the atmosphere of the location—and which stereo configuration you will use. That decision shapes everything else: position, input sensitivity, take length and how you name the files afterwards.

Portable Recorders

Portable recorders fall into two families. Handheld units with integrated stereo capsules are fast, discreet and very convenient for ambiences and individual sounds; field units with XLR inputs let you connect external microphones, supply them with 48 V and control each channel separately.

What to inspect is the handling, rather than the list of formats. Being able to adjust the level manually comes first: automatic control reacts to gust peaks or a passing car and modulates the noise floor, which cannot be fixed later. A hardware limiter, low-cut filters and a headphone output with its own volume complete the list. Power and a card that last through long sessions prevent losing a scene to a battery.

For format, recording in uncompressed WAV, normally at 48 kHz and 24 bits, gives you editing headroom. The relationship with formats and bit depth is explained in the audio formats and spectrograms guide.

Three settings should be prepared before leaving home. First is the clipping limit or limiter: enable it as a safety net without having it intervene on every take, because a limiter working digitally adds distortion you cannot undo. Second is the low-cut filter: off by default and enabled only when wind or traffic justifies it. Third is input sensitivity: raise it for distant sources and lower it for nearby ones, rather than leaving it fixed and accepting the result. Before every scene, glance at the battery and card: losing a recording through lack of space is the worst loss, because it cannot be repeated.

Stereo Microphones

Stereo microphones solve the problem of capturing a scene with two channels in one body. Common configurations are an X-shaped pair pointing in opposite directions, giving a stable image, and a spaced AB pair, giving more width at the cost of mono compatibility. Some recorders let you change the capsule, directly enabling that choice.

Two criteria decide. First: where the dominant source is. If the interesting sound is in front, the pair should not point at the wall opposite. Second: the intended playback. For screens and mono systems, a restrained technique is preferable; for headphones and video with ambience, you can open it wider. The balance between angle, spacing and polar pattern is covered in detail in AB, Blumlein and Mid/Side Stereo Techniques.

Remember that boom or shotgun microphones are highly sensitive on-axis: a directional microphone pointed badly will capture the room rather than the subject, and EQ will not recover that difference.

Wind Protection and Handling Noise

Wind protection is the physical defence against wind: foam, a furry cover or a basket with a cover. The principle is the same in all of them: create a layer of still air around the capsule so a gust does not strike it directly. Foam works in a light breeze; a furry cover withstands considerably more; a basket with a double cover is the reference for outdoor work in real wind.

Handling noise is noise transmitted by the support: a hand rubbing, a stand touching the ground or a cable hitting the pole. Fight it with shock-mounted supports, hold the equipment by its base rather than the microphone, and avoid taut cables carrying vibration to the capsule. One sharp handling thump ruins a take that would otherwise have worked.

Combined with the low-cut filter, the result is much better than either alone: protection prevents impacts, and the filter removes residual energy below 100 Hz.

Ambiences: Recording a Space with Intent

Ambiences does not mean waiting with the recorder running: it means recording with a purpose. NPR’s checklist summarises the method: anticipate the scene’s sounds, break it into elements—footsteps, wind, murmur and distant traffic—and record them separately, moving closer rather than raising gain.

Three habits greatly improve the material. First, record the scene’s room tone: a period of silence with the same equipment and levels, letting you edit and extend later without it being noticeable. Second, maintain levels throughout the take so the material can be cut and joined. Third, record longer than planned: at least ninety continuous seconds per scene, because a short take leaves no room for cleanup or transitions.

Also listen to the material on location, through the same headphones, and compare it with what your ears hear: recording and perception rarely coincide, and that difference is what must be corrected in the field.

Field Mistakes and How to Avoid Them

• Automatic level enabled. It makes the noise floor rise and fall; use manual control.
• No wind protection. Without a cover, a gust clips the entire channel.
• Support touching the ground. Handling travels through the stand to the capsule.
• Position not checked. Five seconds of listening before recording saves the whole take.
• Takes too short. They leave no material for editing or later decisions.
• No room tone. Extending or joining the scene naturally becomes impossible.

Workflow for an Outing

A well-run field session has three phases and takes more time outside than at the computer.

Before leaving. Check the map or route and decide which scenes to seek, rather than waiting to see what appears. Prepare charged batteries and clean cards, bring wind protection and a shock-mounted support, and check the equipment at home with a one-minute test recording: if that test has background noise or clipping, correct it there, rather than out in the field.

During the outing. Arrive, listen through headphones, position, record the full scene without touching the equipment, and take notes. Notes can be on paper or spoken into the recorder itself: location, time, source and incidents. That habit lets you distinguish a good take from an almost-good take three months later.

On returning. Copy the material to two destinations, give it an initial review and discard unusable material, then tag what remains. Review through headphones and make a second pass over filenames; skipping it postpones a task that would take ten minutes today.

Next Step

With field material captured and protected from wind, it is time to turn it into raw material: Advanced Field Recording: Foley, City, Metadata and Your Own Libraries.