Shure BETA-91 Half Cardioid Condenser Boundary Microphone

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Shure BETA-91 Kick Drum Condenser Low Profile Microphone

The Shure Beta 91™ is specifically designed for kick drums and other bass instruments.

The Beta 91 combines superior "attack" and "punch" for studio quality sound, even at the extremely high sound pressure levels encountered inside a kick drum. Its boundary effect design produces a strong, solid low-end response that has been specifically tailored for heavy bass applications.

The microphone's cardioid pattern provides outstanding gain-before-feedback and excellent rejection of unwanted sound, making the Beta 91 ideal for live concert applications. The low profile design of the Beta 91 eliminates the need for external mounting hardware - just throw it in your kick drum and play.
  • Frequency response shaped specifically for kick drums and other instruments
  • Wide dynamic range for use in high SPL environments
  • Low-profile design requires no external mounting hardware
  • Detachable cable for easy storage
  • Legendary Shure quality, ruggedness, and reliability

Interchangeable replacement cartridges:

  • RPM108: Cardioid
  • RPM110: Supercardioid
Cardioid condenser (electret bias)
Frequency Response
20 to 20,000 Hz (measured at 304.8 mm [1 ft] from a spherical sound source, free field conditions)
Polar Pattern
Half-cardioid (cardioid in hemisphere above mounting surface), uniform with frequency, symmetrical around axis.
Output Level (at 1,000 Hz)
Open Circuit Voltage: -59 dBV/Pa* (1.1 mV) typical
*1 Pa = 94 dB SPL
Maximum SPL
(20 Hz to 20 kHz, less than 1% THD)
2.5 kilohm load: 160 dB
1 kilohm load: 156 dB
Preamplifier Output Clipping Level
(20 Hz to 20 kHz, less than 1% THD*)
2.5 kilohm load: 6 dBV (2.0 V)
1 kilohm load: 2 dBV (1.26 V)
*THD of the microphone preamplifier when applied input signal is equivalent to the cartridge output at specified SPL.
Dynamic Range
(20 Hz to 20 kHz, less than 1% THD, 2.5 kilohm load)
125 dB (max SPL minus A-weighted noise)
Output Noise
35 dB SPL (typical), A-weighted
Signal-to-Noise Ratio
59 dB re 94 dB SPL
Output Impedance
150 ohms (actual)
Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Phantom Power: 48 Vdc +/- 4 Vdc (IEC-268-15/DIN 45 596), positive pins 2 and 3
Electromagnetic Hum Pickup
-7.5 dB equivalent SPL in 1 mOe field (60 Hz)
4.6 m (15 ft) heavy-duty, two-conductor shielded, TA4F to TA3F connectors
Matte-black , painted, die-cast, zinc-alloy case with matte-black steel grille
95mm x 129 mm x 19 mm (3.75 in. x 5.08 in. x 0.75 in.)
Net Weight
382 grams (13.5 oz) less cable


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