- Polar pattern describes the area in which a microphone picks up sound — it determines what you capture… and what you leave out.
- The main families are cardioid (front-focused), its tighter variants supercardioid and hypercardioid, omnidirectional (360° pickup) and bidirectional (front + rear, figure-of-eight).
- The right choice depends on the source, the room and the context (studio, stage, podcast).
- A multi-pattern microphone remains the most versatile solution when you want to cover everything with a single tool.
People often say that a microphone is like a pair of ears. Except not all ears listen in the same direction: some pick up what’s right in front of them, others capture everything around them. This behaviour is called the polar pattern. It’s a criterion that’s often overlooked when buying a mic, yet it’s the one that makes the difference between a clean recording and a sonic mess. Before talking about capsules, tubes or frequency response, you need to understand where your microphone is listening. Here’s everything you need to know to make the right call.
What exactly is a polar pattern?
The polar pattern (or pickup pattern) describes a microphone’s sensitivity based on the angle from which sound arrives. In plain terms: certain zones are favoured, others are attenuated or even ignored. It comes down to physics. When sound hits the diaphragm from one side only, you get a pressure microphone — which produces omnidirectional pickup. When it hits both sides, you have a pressure-gradient microphone — hence a bidirectional polar pattern.
Combining these two systems produces all the intermediate polar patterns: cardioid, supercardioid, hypercardioid. The main thing to remember is that a polar diagram reads like a top-down map. The more the shape points in a given direction, the more sensitive the mic is in that direction. Now you can see why two microphones that look identical on paper can deliver radically different results.
The cardioid: the Swiss Army knife
By far the most common polar pattern — and for good reason. A cardioid boosts sensitivity on-axis: the pickup zone faces forward, tracing that famous heart-shaped diagram (hence the name). Sources placed in front of the mic are favoured; those positioned behind are heavily attenuated.
What’s it actually useful for? Isolating a source in a busy environment. It’s the most widely used type in the studio, since cardioids are less prone to feedback (that piercing squeal that builds when the mic re-injects the speaker signal). On stage and in home studios alike, it lets you capture a voice without picking up the guitar amp next door.
- Lead vocals in the studio or live
- Acoustic guitar and solo instruments
- Targeted drum recording (snare, toms)
- Any context where source isolation is the priority
The Shure SM86 is a textbook example of the cardioid philosophy applied to vocals: faithful voice reproduction and solid rejection of ambient noise. For detailed acoustic instrument recording, the Rode NT5 (as a matched pair) is a reliable choice with its precise cardioid pattern.
Cardioids accentuate the proximity effect: the closer you move the source to the mic, the more the low end builds up. A great asset for adding body to a broadcast voice, but a trap if you’re after a natural sound. Play with the distance to dial in exactly the amount of bass you want.
Supercardioid and hypercardioid: a tighter beam
Find the cardioid too broad? Its two variants push the focus even further. The supercardioid and hypercardioid narrow the pickup angle even more towards the front: the tighter the diagram, the more the mic ignores what surrounds it. The hypercardioid is the more directional of the two, with an even narrower acceptance angle than the supercardioid.
The trade-off? Both patterns have a small rear lobe: a zone of residual sensitivity directly behind the mic. The null point no longer sits at 180° but slightly off to the rear sides (around 125° and 235° for the supercardioid). This changes everything for stage monitor placement: you need to aim at that off-axis null, not straight behind the mic, or you risk picking up feedback.
- Lead vocals on stage in a very loud environment
- Maximum isolation of a source surrounded by others (drums, brass band)
- Mid-distance capture where off-axis rejection is critical
- Any context where gain before feedback needs to be pushed to the limit
On stage, the Shure Beta 87A is the perfect showcase for the supercardioid: exceptional isolation, excellent gain before feedback, and minimal off-axis colouration. For even tighter rejection, the Audix OM5 and its hypercardioid pattern isolate the voice from other instruments with formidable feedback resistance.
With a supercardioid or hypercardioid on stage, never place your monitor directly behind the mic — that’s where the rear lobe sits. Angle it slightly to the side to aim at the true null point. You’ll gain several extra decibels before feedback kicks in.
Omnidirectional: capturing the space
As its name suggests, an omnidirectional mic picks up sound with equal sensitivity in all directions, a full 360°. No favoured zone, no dead spot. The microphone hears everything equally, whether you’re in front, behind or to the side.
Why choose a mic that filters nothing? Because omni delivers the most natural sound possible. No proximity effect, a frequency response that’s often more linear, and a pickup of the room’s acoustics that adds air and depth. It’s the purist’s choice for room ambience recordings, ensembles, and sessions where the space itself is part of the sound.
- Room ambience and room recording
- Acoustic ensembles, choirs, orchestras
- Immersive stereo recording (two spaced omnis)
- Acoustically treated environments where an accurate, natural sound is the goal
The flip side? In a noisy or untreated space, an omni picks up absolutely everything: the air conditioning, the street noise, the echo in your living room. Save it for rooms that sound great, or for when you actually want to capture the atmosphere.
Recording a podcast with two people at a table? Instead of a single omni that’ll capture both voices plus the room, go for two separate cardioids. You keep each voice on its own track and have far greater control over your mix.
Bidirectional: the figure-of-eight
Less known to the general public, the bidirectional (or figure-of-eight) pattern picks up sound from both the front and the rear of the mic, while completely rejecting the sides. Its polar diagram traces two opposing lobes — hence the nickname.
It’s the go-to pattern for two specific uses. First, face-to-face interviews or duets: a single mic captures both participants seated on either side of it. Then advanced stereo recording techniques, such as Mid-Side (a cardioid + a figure-of-eight) or Blumlein (two figure-of-eights crossed at 90°), which deliver a wide, mix-adjustable stereo image.
The figure-of-eight pattern is found almost exclusively on high-end large-diaphragm microphones, often tube-based, such as the Rode K2, whose polar pattern can be continuously adjusted from omni to bidirectional. A true sonic toolbox for those who want to explore every possibility.
What about switchable polar patterns?
Still not sure? Good news: you don’t necessarily have to choose. Many condenser microphones offer multiple switchable polar patterns via a selector switch. Switch from cardioid to omni or figure-of-eight in an instant, depending on what you’re recording.
This is the most versatile option, ideal for a home studio where you’re constantly switching between vocals, guitar, room recording and duets. The Prodipe STC-3D MK2 offers the three classic polar patterns (cardioid, bidirectional, omnidirectional) at an accessible price: cardioid to isolate a source, bidirectional for a duet, omni for a full ensemble sound. As a reference-grade option, the Neumann U87 Ai delivers its three iconic patterns that have shaped the sound of countless albums. And for the most demanding users, the AKG C314 goes up to four modes (cardioid, supercardioid, omni, figure-of-eight).
On multi-pattern microphones, change the polar pattern before finalising your placement, never after. Each pattern subtly alters the frequency response and the proximity effect. Moving a cardioid back a few centimetres after switching to omni can completely change the sound of the take.
How to choose in practice
No need to panic: the choice comes down to a few straightforward questions. What are you recording, in what kind of room, and how much flexibility do you need? Here’s a quick decision guide.
- A single voice or instrument in an untreated room → cardioid, no question. Isolation is everything.
- Lead vocals on stage, surrounded by loud sources → supercardioid or hypercardioid to push gain before feedback.
- Room ambience, an ensemble, a great-sounding space → omnidirectional for natural sound and air.
- A face-to-face interview or advanced stereo work → bidirectional (figure-of-eight).
- You do a bit of everything and want a single mic → switchable polar patterns, flexibility above all.
Bear in mind that polar pattern is just one criterion among many: transducer technology (dynamic or condenser), diaphragm size and max SPL (maximum sound pressure level) all matter too. But starting with the polar pattern means asking the right question straight away: what do I want to hear, and what do I want to keep out?
If you’re just starting out and working with a tight budget, go for a cardioid: it’s the most forgiving in imperfect rooms and the one you’ll reach for most often. You can always add a multi-pattern mic to your setup later as your needs evolve.
Final thoughts
Choosing a polar pattern isn’t some obscure science reserved for sound engineers. It’s a matter of common sense: you decide where your microphone should listen, and what it should ignore. Cardioid for targeting, its super- and hypercardioid variants for an even tighter beam on stage, omni for embracing the space, figure-of-eight for two-person setups, and multi-pattern when you want to do it all. Once this logic clicks, you’ll never look at a spec sheet the same way again. And the day you put the right polar pattern on the right source, you’ll hear the difference: a clean, controlled recording that just sounds right.
