Using a Field Audio Recorder for Clean Sound

By Camera Clix | Published: 2026-10-19

Category: How-to Guides

Learn how to use a portable field audio recorder to capture clean, professional sound for video and audio projects. Step-by-step guide with practical tips.

Quick answer

To get clean sound with a field audio recorder, choose a model with adjustable directionality and high sound pressure resistance, then follow a consistent setup process for gain, placement, and monitoring.

Why a dedicated recorder beats camera audio

Built-in camera microphones are small, omnidirectional, and placed far from the subject. They pick up handling noise, wind, and room echo. A dedicated field audio recorder with larger, directional microphones captures clearer dialogue and ambient sound with less interference.

The trade-off is that you now have a separate device to sync in post. Most video editors can align audio waveforms automatically, but it adds a step to your workflow. For critical projects, the improvement in sound quality is worth the extra effort.

Understanding directionality and gain staging

Not all field recorders handle directionality the same way. Some offer fixed cardioid or omnidirectional patterns. Others, like the OM SYSTEM LS-P5, let you adjust directionality in 21 levels. This is useful when you need to focus on a single speaker or capture a wide ambient scene without swapping microphones.

Gain staging is equally important. Set your recording level so the loudest peaks hit around -12 dB to -6 dB. This gives you headroom to prevent clipping while keeping the signal strong enough to avoid raising the noise floor in post.

How to set up your field audio recorder for clean sound

1. Choose the right recording format and sample rate: Set your recorder to Linear PCM (WAV) at 48 kHz / 24-bit for video projects or 44.1 kHz / 16-bit for music. Linear PCM gives you uncompressed audio that syncs easily with video. FLAC is a good alternative if you need smaller files without losing quality. Avoid MP3 for critical recordings — the compression removes detail that cannot be recovered.
2. Adjust directionality to match your subject: If your recorder supports adjustable directionality, set it to a narrow pattern for a single speaker or a wider pattern for group conversations or ambience. On the OM SYSTEM LS-P5, you can choose from 21 levels to get the exact reach you need. A common mistake is leaving the recorder on omnidirectional indoors — you will pick up more room echo than intended.
3. Set gain and monitor with headphones: Start with gain at about 50-60% of maximum. Speak at your expected loudest level and adjust so peaks hit -12 dB to -6 dB on the meter. Always wear closed-back headphones to hear what the microphone actually captures, not what you think it should capture. If you cannot hear background hum or rustling in your headphones, you will hear it in post — fix it before recording.
4. Position the recorder close to the sound source: Place the recorder 6 to 12 inches from the subject for speech. For ambience, position it where you want the listener to feel they are standing. Use a tripod or a mini stand to isolate the recorder from handling noise. Hand-holding the recorder introduces low-frequency rumble. A cheap mini tripod or a simple desktop stand makes a huge difference.
5. Use a windscreen or deadcat outdoors: Even light wind causes low-frequency rumble that ruins a take. Attach the supplied windscreen or a fur deadcat over the microphones. Some recorders handle up to 125 dB SPL without distortion, but wind is mechanical noise, not level — it needs physical blocking. Do not rely on a low-cut filter alone outdoors. It helps, but a windscreen is essential for clean sound.

Product facts

OM SYSTEM LS-P5 Linear PCM Recorder Black: The OM SYSTEM LS-P5 features a TRESMIC II microphone system with three large high-performance directional microphones and directionality adjustable in 21 levels. You can fine-tune the pickup pattern to match your scene — narrow for an interview or wide for ambient sound — without carrying extra microphones.
OM SYSTEM LS-P5 Linear PCM Recorder Black