A polar pattern describes how a microphone responds to sound arriving from different directions.
Patterns are not invisible walls. Off-axis sound is reduced and often colored rather than completely removed. Understanding the front, sides and rear of a microphone helps you control room reflections, instrument bleed and monitor noise before recording begins.
Cardioid for focused capture
Cardioid microphones are most sensitive at the front and least sensitive toward the rear. Point the rear null toward a noisy computer, open doorway or loud instrument when possible. Cardioid designs usually create more bass as the source moves very close, known as proximity effect.
Omnidirectional for natural space
An omni pattern captures sound from all directions and generally has little proximity effect. In a good room it can produce open, realistic vocals and acoustic instruments. In an untreated room it also captures more reflections, so placement becomes especially important.
Figure-eight for side rejection
Figure-eight captures the front and rear while strongly rejecting the sides. This makes it useful for two performers facing one microphone, mid-side stereo and situations where side nulls can isolate nearby sound. Remember that the rear lobe has the opposite polarity.
Test the actual microphone
Published diagrams are simplified and response changes with frequency. Wear headphones, speak while moving around the microphone and listen to how tone changes off-axis. Then position unwanted sound toward the most useful null rather than choosing a pattern by habit.
Practical checklist
- Identify the active side of the microphone.
- Aim nulls toward unwanted sound.
- Account for cardioid proximity effect.
- Use omni only when the room supports it.
- Record a placement test before the take.
Frequently asked questions
Does cardioid remove all rear sound?
No. It reduces rear pickup, but reflections and low frequencies can still enter the recording.
Which pattern is best for vocals?
Cardioid is a practical default, while omni or figure-eight can be excellent when the room, singer and creative goal support them.
Final takeaway
Choose a pattern together with a position. Directional control works best when the microphone, source and room are treated as one system.
