The Shure Beta 91A Boundary Microphone is designed for use with kick drums, as well as other traditional low-frequency applications including piano. Featuring an updated microphone capsule, integrated preamplifier, and XLR connection, the Shure Beta 91A offers a strong low-frequency response and is specifically tailored for bass frequency applications. The Shure Beta 91A combines superior attack and punch for studio-quality sound, even at extremely high sound pressure levels (SPL).

• Uniform half-cardioid polar pattern for maximum gain-before-feedback and rejection of off-axis sound
• Precision-engineered low-profile design features integrated preamplifier and XLR connector to maximize setup efficiency while minimizing stage clutter
• Frequency response tailored for kick drum/low frequency applications with a wide dynamic range for use in high SPL environments
• Two-position contour switch to maximize attack and clarity depending on application: select the flat response setting for natural sound in most applications or the “low-mid scoop” setting for a strong low frequency “punch” with plenty of higher frequency attack
• Requires no external mounting or accessories for ease of use and storage
• Furnished with zipper pouch

• Type: Condenser (Externally Biased)
• Frequency Response: 20 to 20,000 Hz
• Polar Pattern: Half-Cardioid (Cardioid in Hemisphere Above Mounting Surface)
• Impedance: 146 O
• Sensitivity (at 1 kHz, Open Circuit Voltage): -48.5 dBV/Pa (3.8 mV) 1 Pascal=94 dB SPL
• Maximum SPL (1 kHz at 1% THD):
  • 1000 O Load: 151 dB
  • 2500 O Load: 155 dB
• Signal-to-Noise Ratio (Referenced at 94 dB SPL at 1 kHz): 85.5 dB
• Dynamic Range (at 1 kHz):
  • 1000 O Load: 121.5 dB
  • 2500 O Load: 125.5 dB
• Common Mode Rejection (20 Hz to 20 kHz): > 55 dB
• Clipping Level (20Hz-20 kHz at 1% THD):
  • 1000 O Load: 7.50 dBV
  • 2500 O Load: 12.5 dBV
• Self Noise (Typical, Equivalent SPL, A-Weighted): 29.5 dB SPL-A
• Polarity: Positive Pressure on Diaphragm Produces Positive Voltage on Pin 2 with Respect to Pin 3
• Weight Net: 470 g (16.6 oz.)
• Frequency Contour Switch: 7 dB of Attenuation Centered at 400 kHz
• Connector: Three-pin Professional Audio (XLR), Male, Balanced
• Power Requirements: 11-52 VDC Phantom Power (IEC-61938), 5.6 mA

• 1 x Shure Beta 91A Boundary Microphone
• 1 x Shure 95A2314 Storage Bag
• 1 Year Warranty