Instrument Microphone Beta 91A

Powerful, Clear Kick Drum & Bass Capture

The Shure Beta 91A is a half-cardioid boundary microphone specially designed to deliver powerful, clear sound from kick drums, bass cabinets, and other low-frequency instruments. Its unique boundary design and half-cardioid polar pattern provide excellent isolation and minimal phase interference, ensuring punchy, focused audio.

Ideal for both live and studio applications, the Beta 91A is built tough to withstand rigorous use while delivering professional-grade performance.

🔑 Key Features

🔹 Uniform half-cardioid polar pattern for maximum gain-before-feedback and off-axis rejection
🔹 Low-profile design with integrated preamplifier and XLR connector for easy setup
🔹 Frequency response tailored for kick drum and low-frequency applications
🔹 Two-position contour switch: flat response or low-mid scoop for punchy attack
🔹 Requires no external mounting—place directly inside kick drum or bass cabinet
🔹 Handles extremely high SPLs with low distortion
🔹 Rugged, reliable construction for live and studio use
🔹 Requires phantom power (48 V)

💡 Ideal for: Kick drums, bass cabinets, percussion, piano, live concerts, studio recordings, corporate events.

• 🔹 Microphone type: Condenser, boundary
  🔹 Polar pattern: Uniform half-cardioid
  🔹 Frequency response: Tailored for kick drum/low-frequency range, 20 Hz – 18 kHz
  🔹 Sensitivity: 4.6 mV/Pa
  🔹 Equivalent noise level: 20 dB-A
  🔹 Max SPL: 160 dB
  🔹 Output impedance: 150 ohms
  🔹 Connector: Integrated XLR
  🔹 Weight: approx. 186 g
  🔹 Dimensions: 129 x 87 x 19 mm

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  Note: The Beta 91A features an updated microphone capsule offering a more natural high-frequency response compared to the Beta 91. For a supercardioid alternative with even more low-end emphasis, consider the Shure Beta 52A.

Featuring a precision-engineered low-profile design with an integrated preamplifier and XLR connector, the Beta 91A maximizes setup efficiency while minimizing stage clutter. It requires no external mounting and is built to handle extremely high SPL environments, delivering superior attack and punch with studio-quality sound.

The microphone includes a two-position contour switch that allows you to tailor the sound:

• • Flat response for a natural sound in most applications

• • Low-mid scoop for a strong low-frequency punch with enhanced high-frequency attack

• What is the Beta 91A best suited to?

The primary use of the Beta 91A is kick drums. It can also be used for other low frequency applications including piano. 

What are the characteristics of the Beta 91A?

The Beta 91A is a half cardioid condenser boundary microphone. You can expect a strong low end response as it is specifically tailored for bass frequency applications, and superior attack and punch for studio quality sound even at extremely high sound pressure levels (SPL). 

What is the difference between the Beta 91A and the Beta 91?

The Beta 91A features a new and updated microphone capsule. The new capsule will result in a more natural high frequency response than the Beta 91.

Are there any other Shure Kick Drum microphones? 

The Beta 52A is a super cardioid microphone and is also suited to kick drums. With the Beta 52A you can expect even more low end.

• Capture the full depth and punch of your kick drum and bass instruments with the Shure Beta 91A — a professional boundary mic trusted worldwide.
  📦 Rent the Shure Beta 91A now for your next event or studio session.

For more details on Shure Beta 91A Boundary Microphone specifications, click here.