How to read a microphone polar pattern chart for better miking

A microphone polar pattern chart shows how sensitive a microphone is to sound arriving from different directions. It is one of the most useful tools for choosing mic placement, controlling bleed, and capturing a source with the right balance of direct sound and room ambience. Once the chart becomes familiar, you can make placement decisions before moving a stand or recording a test take.

The circular graph may look technical, but its basic information is straightforward. The top of the circle usually represents the front of the microphone, the bottom represents the rear, and the sides show sound arriving from 90 degrees off-axis. The farther a plotted line extends toward the outside edge, the more sensitive the microphone is at that angle.

A polar pattern is not a promise that every frequency behaves identically. Manufacturers often provide separate curves for bass, midrange, and treble because a microphone can reject low frequencies differently from high frequencies. Reading those curves alongside the microphone’s physical design, the source, and the room gives you a much more useful prediction than relying on the pattern name alone.

Start with the chart’s orientation and scale

Most polar response charts use decibels to show sensitivity relative to the microphone’s front-facing response. The outer ring commonly represents 0 dB, while inner rings may show -5, -10, -15, or -20 dB. A point at -10 dB means sound from that direction is captured considerably quieter than sound arriving directly at the front, though the perceived difference will also depend on the source and the surrounding acoustics.

The angle markings tell you where the sound is coming from. Zero degrees is normally the center line in front of the capsule, 90 degrees is directly to one side, and 180 degrees is directly behind it. If you rotate a microphone while watching the chart, imagine the chart rotating with the microphone. The “front” is determined by the capsule’s intended pickup direction, not by the direction the stand happens to face.

A smooth, symmetrical curve usually indicates predictable rejection. A lopsided or irregular curve may reveal the effect of the microphone body, grille, capsule construction, or internal acoustic design. Symmetry matters when you are trying to reject a monitor, another performer, or a nearby instrument. If the unwanted sound sits at an angle where the pattern has a deep null, a small change in orientation can make a large difference.

Recognize the common pickup patterns

An omnidirectional microphone has a nearly circular response. It hears from all directions, although real microphones are rarely perfectly omnidirectional at every frequency. Omnis often retain a natural low-frequency response and avoid the strong proximity effect associated with directional microphones. They can work well for room capture, acoustic instruments, ensembles, and speech when the surrounding space sounds appealing.

A cardioid pattern resembles a heart and is most sensitive at the front, with its greatest rejection at the rear. This is a practical general-purpose pattern for vocals, guitar amplifiers, snare drums, and many voice-over situations. A cardioid microphone can reduce sound from a loudspeaker or reflective wall behind it, but it still hears from the sides and may capture room sound if the space is lively.

Supercardioid and hypercardioid patterns narrow the front pickup area and offer stronger side rejection than a standard cardioid. Their tradeoff is a small rear pickup lobe. That rear lobe is easy to overlook on a polar pattern chart. If you place a monitor or noisy instrument directly behind one of these microphones, the result may be louder than expected. A careful engineer aims the side null or the weakest part of the rear response toward the unwanted source.

A figure-eight microphone is equally sensitive at the front and rear while rejecting sound from both sides. This bidirectional pattern is common in ribbon microphones and is valuable for mid-side recording, Blumlein stereo, vocal duets, and controlled room capture. The side nulls can be extremely useful, but the front and rear sides of the microphone usually capture different acoustic environments, so the room behind the mic matters as much as the room in front.

Use nulls, lobes, and off-axis response

The deepest point in a polar pattern is called a null. It identifies the direction from which the microphone rejects the most sound. A null is not always a complete silence, and its accuracy may vary by frequency, but it is often more useful than the broad label “cardioid” or “figure-eight.” Positioning an unwanted source at that angle can reduce bleed without requiring a lower performance level.

Lobes are areas of increased sensitivity. An omni has one broad all-around lobe, a cardioid has a front lobe, and a supercardioid or hypercardioid includes a smaller rear lobe. Figure-eight microphones have two major lobes. When planning a setup, map both the wanted source and the unwanted sources onto the chart. This turns microphone placement into a directional problem you can solve deliberately.

Off-axis response describes what happens when sound arrives from an angle rather than straight into the capsule. Two microphones may have similar front-facing frequency responses but sound very different when a source moves off-axis. A smooth off-axis response tends to preserve the source’s tonal character while making it quieter. An uneven response may make the sound dull, nasal, hollow, or harsh as the performer moves.

This detail is especially important for singers, audiobook narrators, and presenters who naturally turn their heads. A microphone with a smooth off-axis character can produce more consistent tone, while a sharply directional microphone may reward disciplined positioning. For a moving performer, a slightly wider pattern can sometimes sound more professional than a tighter pattern that changes color dramatically with every movement.

Read frequency curves instead of one shape

Many polar charts include several lines in different colors. These lines may represent 125 Hz, 250 Hz, 1 kHz, 4 kHz, or another set of test frequencies. The legend is essential. A pattern that looks tightly controlled at 1 kHz may become nearly omnidirectional in the bass, while high frequencies may show stronger front focus or irregular side lobes.

Low-frequency pattern widening is common in directional microphones. Bass wavelengths are long, and the microphone may not reject low-frequency sound as effectively as midrange sound. This means a cardioid microphone can still pick up traffic, HVAC rumble, footfalls, or bass energy from behind. Physical isolation, filtering, and room control may be needed in addition to directional placement.

High-frequency response often becomes more directional. A microphone may reject treble strongly at the sides while allowing more low-mid energy through. That can reduce brightness on off-axis sound but leave a thicker or darker version of the unwanted source. The chart therefore helps you anticipate bleed character, not simply bleed level.

Match the pattern to the recording situation

For a lead vocal in a controlled booth, cardioid often provides a useful balance of focus and rejection. Place the rear of the microphone toward the loudest reflective or noisy area, and use a pop filter to maintain a consistent working distance. If the singer moves significantly, test whether the pattern’s off-axis coloration becomes distracting. A microphone with a wider or smoother response may produce a steadier take.

For an acoustic guitar, pattern selection depends on the instrument, room, and other performers. A cardioid microphone aimed toward the desired tonal area can limit room sound, while an omni may produce a more open and natural recording in a good-sounding space. With a figure-eight microphone, the side nulls can help reduce a nearby vocalist or guitar amplifier, but the rear lobe must be considered carefully.

Drum recording illustrates why polar patterns should be treated as a system. A cardioid overhead can favor the kit while reducing some room sound, but its rear rejection may point toward a wall or cymbal reflection. A figure-eight room microphone can capture a dramatic front-and-rear perspective with side rejection. Supercardioid close microphones can control neighboring drums, provided their rear lobes are aimed away from troublesome sources.

For speech, the microphone’s pattern interacts with the voice, the room, and the speaker’s movement. A tightly focused microphone is not automatically better. If the speaker turns away frequently, the changing off-axis tone may be more audible than the room noise a narrower pattern was intended to prevent. Once tracks are recorded, careful cleanup can support the microphone choice; these audio editing techniques can help remove distractions without making speech sound unnaturally processed.

Apply placement principles in the room

Begin by identifying the sound you want and the sound you want to reduce. Rotate the microphone so its most useful null points toward the unwanted source. This might mean aiming a cardioid microphone’s rear toward a guitar amplifier, placing a figure-eight side toward a loud computer fan, or positioning a supercardioid rear lobe toward a quieter part of the room.

Distance changes the balance between direct sound and reflected sound. Moving closer generally increases direct sound and, with many directional microphones, increases proximity effect. Moving farther away allows more room tone and may make the pattern’s rejection less useful because reflections arrive from many directions. The best position is therefore a combination of angle, height, distance, and room orientation.

The three-to-one rule can help when recording multiple similar sources. Keep microphones separated by roughly three times the distance from each microphone to its intended source. This does not eliminate bleed, but it can reduce phase problems and make the bleed more manageable. Polar pattern nulls and the three-to-one rule work together: distance controls level relationships, while orientation controls directional rejection.

Do not assume the printed diagram predicts every room perfectly. Polar patterns are commonly measured in an anechoic or controlled environment, while a studio contains reflections, equipment, performers, and nearby surfaces. A wall close to the rear of a microphone can reflect sound back into the capsule even when the direct rear response is low. Use the chart as a starting point, then confirm the result with headphones and a short test recording.

Build a repeatable miking workflow

Before recording the full performance, place the microphone according to the chart and record a few seconds of the source. Listen for direct tone, room contribution, unwanted bleed, sibilance, plosives, and changes caused by movement. Then make one adjustment at a time. Changing pattern, angle, distance, and source position simultaneously makes it difficult to learn what actually improved the recording.

Document the setup when a sound works. Note the microphone model, selected pattern, capsule height, distance, angle, preamp level, and the direction of nearby noise sources. This is particularly useful for overdubs, audiobook sessions, recurring podcast production, and commercial voice work. A repeatable setup saves time and gives performers confidence when a project returns for pickups.

Use headphones for monitoring, but trust the recorded track rather than the sound at the microphone position. Headphone monitoring can conceal room reflections or make a source seem more isolated than it is. Check the track at a moderate level and compare multiple placements at matched volume. A louder recording can seem better simply because it is louder.

• Identify the loudest unwanted source before choosing a pickup pattern.
• Aim the microphone’s strongest null toward that source whenever possible.
• Check every frequency curve on the manufacturer’s chart, not just the pattern outline.
• Test off-axis movement if the performer will turn, sway, or change distance.
• Record short comparisons and choose the position that needs the least corrective processing.

A professional recording room makes these decisions easier because microphone choices can be tested through multiple channels, instruments, and monitoring options. At LnL Recording, recording, overdubbing, editing, mixing, and mastering can be handled as connected stages, which helps preserve the benefits of a thoughtful microphone setup through the final production.

When a chart is unclear, the microphone documentation and the actual session are the best references. The studio FAQs can provide practical information about recording services and session logistics before you plan a project that depends on specific microphones, isolation, or multi-channel tracking.

The most effective use of a polar pattern chart is simple: predict the directional relationship, test it in the real room, and adjust until the wanted sound is clear with manageable bleed. Contact LnL Recording to schedule a session for vocals, instruments, podcasts, narration, commercials, or voice-over work, and put deliberate microphone placement to work from the first take.