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Microphone Polar Patterns and Proximity Effect, Explained
People often ask: when recording or playing live, what’s the best way to position a microphone? Everyone hopes for an universal answer, but the reality isn’t that simple. The sound a microphone captures is shaped by two key physical concepts. Understand these two things first, and you’ll know better how microphones work with various sources.
What Is a Microphone Polar Pattern?
A polar pattern describes how sensitive a microphone is to sound arriving from different directions. Think of it as a map drawn around the capsule — it shows which directions the mic listens to, and which it ignores.
Omnidirectional
Picks up sound equally from every direction, with no front or back — a full 360° of even pickup. It’s the most natural-sounding pattern, and the only one immune to proximity effect. Representative mics: DPA 4006, Neumann KM183.
For illustration only; actual polar patterns vary by microphone model.
Subcardioid
Sits between omnidirectional and cardioid — slightly front-biased, but still picks up a fair amount from the rear. Less common in instrument applications, but useful when you want a natural sound field with just a bit more focus toward the source. Representative mic: Schoeps MK21.
For illustration only; actual polar patterns vary by microphone model.
Cardioid
The most common pattern, named for its heart-shaped pickup area — high sensitivity at the front, tapering toward the sides, with significant rejection at the rear (typically around 25dB). The vast majority of clip-on instrument mics are cardioid. Representative mics: Shure SM57, DPA 4099.
For illustration only; actual polar patterns vary by microphone model.
Supercardioid
A narrower front pickup angle than cardioid, with stronger side rejection. It has a small pickup zone at the rear (the rear lobe), so monitor placement needs attention. Representative mic: Shure Beta 57A.
For illustration only; actual polar patterns vary by microphone model.
Hypercardioid
Narrower still than supercardioid, with a more pronounced rear lobe. The two terms are often used interchangeably, but they’re technically distinct. Representative mic: Beyerdynamic M88 TG.
For illustration only; actual polar patterns vary by microphone model.
Figure-8 (Bidirectional)
Equally sensitive at the front and rear, with complete rejection at the sides. This is the native pattern of ribbon microphones. Representative mic: Royer R-121.
For illustration only; actual polar patterns vary by microphone model.
Shotgun
Not a simple polar pattern, but a cardioid or supercardioid capsule fitted with an interference tube in front, using phase cancellation to eliminate sound arriving from the sides and achieve an extremely narrow pickup angle. Common in film and broadcast, and rarely seen in instrument recording — but there’s one famous exception.
For illustration only; actual polar patterns vary by microphone model.
Saxophonist Kenny G uses the AKG C747 for live performance — a shotgun condenser weighing just 25 grams, smaller than a ballpoint pen. His technician, Robert Nelson, built a custom mount that fixes the C747 directly to the bell of the saxophone, with the signal sent out via a wireless transmitter. The narrow, hypercardioid-derived pattern from the interference tube provides enough feedback and bleed rejection on a loud stage, while the mic’s wide frequency response faithfully reproduces the distinctive sound of the soprano saxophone. This modified setup lets him walk and play freely, with no cable to tie him down. Only by understanding both polar patterns and how a microphone is built can you arrive at a solution this unconventional — and this sound.
Which Polar Pattern Works Best for Live Performance?
Live performance places two demands on a microphone’s polar pattern: accurate tonal capture, and source isolation — keeping monitor feedback out, and keeping other instruments from bleeding in. Capturing the full instrument and isolating everything else often pull in opposite directions, and the choice of polar pattern is where you find the balance.
Cardioid is the mainstream choice for most live instrument applications. Its front pickup is clear while the sides and rear suppress sound that doesn’t belong to the instrument, effectively reducing feedback and bleed. For acoustic instruments like saxophone and violin, a clip-on miniature condenser with a cardioid pattern is a widely used solution.
Omnidirectional is rarely considered for amplified live settings — as long as there are floor monitors, feedback becomes hard to control. But in classical live recording, where the stage has no monitors, an omnidirectional mic becomes a viable choice — it has no proximity effect and no off-axis coloration, capturing the natural ambience of the room more faithfully. Omnidirectional condensers like the DPA 4006 have a solid reputation.
So What Is Proximity Effect?
We covered polar patterns first because proximity effect only happens with directional microphones: as a directional mic gets closer to the source, the low frequencies are boosted. The closer it gets, the more pronounced the bass buildup.
The physics behind it: a directional microphone works by detecting the pressure difference (pressure gradient) between the front and rear of the capsule. At a distance, sound reaches both sides of the capsule at nearly the same level. Up close, that gradient becomes steeper in the low frequencies, and the directional capsule interprets this as a stronger low-frequency signal — producing a bass boost.
The strength of the proximity effect is proportional to how much the microphone relies on pressure gradient. Cardioid is the weakest; supercardioid and hypercardioid increase in turn; figure-8 is pure pressure-gradient sensing and shows the most pronounced proximity effect. Omnidirectional mics don’t rely on pressure gradient at all, so they’re completely free of it.
It’s worth noting that some microphones are designed to minimize proximity effect at the engineering level. The classic example is the Electro-Voice RE20, which uses “Variable-D” technology — multiple acoustic entry ports along the body of the capsule, each tuned so different frequencies correspond to different effective distances, keeping the pressure-gradient ratio consistent across low and high frequencies. The proximity effect all but disappears. This is why the RE20 has been an enduring choice for broadcast and vocals — and why it’s a favorite among saxophone players too.
Proximity Effect in Live Performance
In practice, proximity effect means that mic distance is also a tone control.
In a live setting, proximity effect is usually something to watch out for. A clip-on mic sits close to the instrument, so you need to be mindful of sending low-end that isn’t part of the instrument’s natural tone to the front-of-house console.
The common fix is a high-pass filter on the console or mic preamp, cutting frequencies below 80–100Hz. This usually leaves the fundamental tone of a saxophone or violin untouched while effectively removing the excess low-end. Some clip-on mics build this switch right into the adapter cable — the SonoFlex microphone, for example, is designed this way.
Proximity Effect in Recording
When recording, proximity effect is sometimes treated as free bass compensation — no EQ required, just move closer to the mic and the sound gains body. The classic “magnetic” broadcast voice is recorded close to the mic, and in Billie Eilish’s work, the same approach gives her breathy delivery an intimate, whispered quality rather than something thin and harsh.
Distance control matters most with instruments that have a wide dynamic range. When a player leans in during an expressive passage, it’s not just the volume that rises — the tone changes too, with more low-end flooding in alongside the level. This is why close-miked acoustic instruments can sound different on playback than they did in the room, even when the playing itself is steady.
Once you understand when proximity effect kicks in, you have a basis for deliberate choices. Move the mic back a few centimetres to clean up muddy low-end; lean in slightly to add weight to a thin sound. Neither is universally right — but both should be intentional decisions rather than accidental results.
To Wrap Up
Polar patterns determine which directions a microphone listens to; proximity effect determines how distance shapes the tone. Together, they explain why the same microphone on the same instrument can sound completely different depending on how it’s positioned.
For live performance, cardioid’s edge in source isolation makes it the default, and proximity effect is usually a side effect to manage. For recording, the relationship between distance, pattern, and tone becomes a tool you can use on purpose.
Understanding these physical properties tells you what kind of microphone you need for live performance and for recording — and how to use it well.
