How does mic distance affect the sound?

Closer placement gives a drier, more direct sound with more bass (proximity effect) and less room ambience. Further placement captures more room sound, giving a natural, spacious quality. The ratio of direct to reflected sound changes with distance.

What is the 3:1 rule?

When using multiple microphones, place each mic at least three times the distance from each other as they are from their respective sources. This minimises phase cancellation between mics — one of the most common multi-mic recording problems.

Does polar pattern affect placement distance?

Yes. Omnidirectional mics pick up sound equally from all directions and can be placed further away in treated rooms. Cardioid mics reject rear sound, allowing closer placement in untreated rooms. Figure-8 mics pick up front and back but reject the sides.

What is critical distance and why does it cap my placement?

Critical distance (Dc) is the point where the direct sound from the source equals the reverberant sound bouncing off the room. Beyond it the room dominates and the recording turns washy. For a clean, direct capture engineers stay well inside Dc — roughly within 30% for an omni, 50% for a cardioid, and progressively further for tighter patterns (because their rear/side rejection lets them favour direct sound at greater range). This calculator uses the Critical Distance you enter (Advanced Options) to cap the maximum recommended placement.

Which polar pattern has the most proximity effect?

Proximity effect — the bass boost as you move closer — is a pressure-gradient phenomenon, so its strength follows the pattern. Figure-8 is strongest (it is a pure pressure-gradient design, with a low-end lift of up to about 16 dB below 100 Hz at very close range), cardioid shows roughly half that boost, super/hypercardioid sit in between, and a true omnidirectional has none.

AudioCalcs

Mic Placement Calculator

Calculate optimal microphone placement distance based on source type, polar pattern and room size.

Sound SourceType of sound source to record

Polar PatternMicrophone pickup pattern

Room Size / TreatmentAffects room reflection balance

Desired CharacterTonal quality you want to capture

How We Calculate This

Base Distance

Each source type has a recommended distance range based on typical recording practice. This is adjusted for room acoustics and desired character.

Adjustments

Recommended = Base Distance × Room Factor × Character Factor × Pattern Factor

Smaller rooms and untreated spaces reduce distance. Ambient character increases it. Omnidirectional patterns increase it.

Critical-distance cap

The maximum placement is then clamped to a fraction of the critical distance (Dc) you set in Advanced Options, so the mic stays inside the direct-sound field: roughly 30% of Dc for an omni, 50% for a cardioid, slightly more for super/hypercardioid. Beyond this the reverberant field takes over and the capture sounds roomy.

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates based on standard formulas. Always verify results for critical applications.