Cardioid vs Omnidirectional vs Figure-8: Polar Patterns Explained

Every microphone has a polar pattern that defines exactly where it picks up sound and where it rejects it. This three-dimensional pickup zone around the capsule determines whether you capture clean dialogue or muddy room reflections, whether background noise disappears or dominates your mix, and whether multiple sources blend smoothly or create phase cancellation disasters.

Understanding cardioid, omnidirectional, and figure-8 patterns gives you the power to choose the right tool for each recording situation. We will examine how each pattern behaves in real environments, which microphones excel with each design, and when to break the conventional rules that most engineers follow blindly.

Cardioid Pattern: The Directional Workhorse

Cardioid microphones pick up sound primarily from the front while rejecting audio from the rear and sides. The pattern resembles a heart shape when viewed from above, hence the name derived from the Greek word for heart. This design makes cardioid mics the default choice for most recording and live sound applications because they isolate the intended source while minimising spill from other instruments or room acoustics.

The Shure SM57 exemplifies cardioid behaviour in practice. Point it at a guitar amplifier and it captures the speaker cone clearly while rejecting the drums behind it. The Audio-Technica AT2020 demonstrates how cardioid condensers work for vocals, focusing on the singer while ignoring reflections from the studio walls. This directional control makes cardioid patterns essential for multi-track recording where each microphone must capture its designated source without interference.

However, cardioid microphones exhibit proximity effect, where bass frequencies increase dramatically as the source moves closer to the capsule. Professional vocalists learn to work this effect for warmth and intimacy, while engineers must compensate with high-pass filtering when the effect becomes excessive. The rear rejection of cardioid mics also creates a null zone directly behind the capsule, useful for positioning monitors or rejecting specific sound sources.

Omnidirectional Pattern: Equal Pickup from All Angles

Omnidirectional microphones capture sound equally from every direction, creating a spherical pickup pattern around the capsule. This design eliminates the proximity effect that affects cardioid mics, providing consistent frequency response regardless of source distance. Omnidirectional mics excel in acoustically treated environments where you want to capture the natural relationship between direct sound and room acoustics.

The DPA 4006 omnidirectional condenser demonstrates how this pattern works for orchestral recording, capturing instruments with natural spatial relationships and room ambience. For dialogue recording, the Countryman B6 lavalier microphone uses an omnidirectional pattern to maintain consistent pickup as the speaker turns their head or moves slightly during filming. The equal sensitivity in all directions means these microphones capture a more natural, three-dimensional sound image.

The challenge with omnidirectional microphones comes from their inability to reject unwanted sound sources. They pick up air conditioning noise, traffic outside, and reflections from hard surfaces with the same sensitivity as the intended source. This makes them unsuitable for untreated rooms or environments with significant background noise, despite their superior frequency response and lack of proximity effect.

Figure-8 Pattern: Front and Back, Nothing Else

Figure-8 microphones, also called bidirectional mics, pick up sound from directly in front and directly behind while completely rejecting sound from the sides. This creates two lobes of sensitivity in opposite directions, forming the figure-8 shape that gives the pattern its name. The front and rear lobes capture sound with opposite polarity, meaning sound waves hitting the back of the mic appear inverted compared to those hitting the front.

The Royer R-121 ribbon microphone showcases figure-8 behaviour perfectly for recording guitar amplifiers. Position it at an angle to the speaker cone and you capture both the direct sound from the front and the room reflection from the rear, creating natural depth and dimension. The AEA R84 demonstrates how figure-8 patterns work for vocal recording, where you can position two singers facing each other on opposite sides of the microphone for duets with natural separation.

Figure-8 microphones require careful positioning because the rear lobe picks up sound just as clearly as the front. This can work to your advantage when recording in a good-sounding room, as the rear pickup adds natural ambience and space to the recording. However, in untreated environments, the rear lobe captures unwanted reflections and noise that can muddy the final result. The complete side rejection makes figure-8 mics useful for rejecting specific sound sources positioned at 90-degree angles to the capsule.

Choosing the Right Pattern for Each Situation

Recording vocals in a home studio demands cardioid pickup to reject room reflections and focus on the voice. The Aston Origin or Rode PodMic provide excellent cardioid performance for spoken word applications, while the Neumann U87 remains the studio standard for sung vocals. These microphones let you work in imperfect acoustic environments by concentrating on the source while minimising problematic room sound.

Ambient recording and classical music capture benefit from omnidirectional patterns that preserve spatial relationships and natural acoustics. The Schoeps CMC6 MK2H excels at orchestral recording where room sound enhances rather than detracts from the performance. For field recording of natural environments, omnidirectional microphones like the Sony ECM-8000 capture immersive soundscapes without the directional artifacts that cardioid mics introduce.

Figure-8 patterns work best when you want to capture two sources simultaneously or when the rear pickup adds desirable room character. Blumlein stereo recording uses two figure-8 microphones positioned at 90 degrees to create natural stereo imaging. The Coles 4038 ribbon microphone made this technique famous in Abbey Road sessions, where engineers used the front-rear pickup to capture both instruments and the studio acoustic signature.

Multi-Pattern Microphones: Flexibility with Compromises

Some microphones offer switchable polar patterns, combining cardioid, omnidirectional, and figure-8 capabilities in one unit. The Audio-Technica AT4050 provides all three patterns with a simple switch, making it versatile for different recording situations without changing microphones. The Neumann U67 and its modern counterpart, the U47 FET, offer pattern switching that has defined countless classic recordings across multiple decades of professional use.

However, multi-pattern microphones often compromise on the performance of individual patterns compared to microphones designed for a single polar response. The dual-diaphragm design required for pattern switching can introduce subtle phase relationships and frequency response variations that dedicated single-pattern microphones avoid. Engineers frequently find that a purpose-built cardioid condenser outperforms the cardioid setting on a multi-pattern mic, even from the same manufacturer.

The practical advantage of multi-pattern microphones lies in their flexibility for project studios and mobile recording situations where carrying multiple dedicated microphones becomes impractical. The ability to switch from cardioid vocals to omnidirectional room recording to figure-8 instrument capture with one microphone justifies the slight performance compromises for many working engineers and home studio owners.

Conclusion

Polar patterns determine success or failure in every recording situation. Cardioid patterns provide directional control for isolation, omnidirectional patterns capture natural spatial relationships in good rooms, and figure-8 patterns offer creative front-rear pickup options. Match the pattern to your acoustic environment and recording goals rather than defaulting to cardioid for everything.