Kick drum microphone provides a strong low-end response and maximum gain-before-feedback due to its half-cardioid polar pattern. It features a two-position contour switch to maximize attack and clarity and a low-profile design. The Shure BETA®91A 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, Beta 91A offers a strong low-frequency response and is specifically tailored for bass frequency applications. The Beta 91A combines superior attack and punch for studio-quality sound, even at extremely high sound pressure levels (SPL). Features 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 Premier live performance microphone with Shure quality, ruggedness, and reliability Uniform half-cardioid polar pattern (in the hemisphere above mounting surface) for maximum gain before feedback and rejection of off-axis sound Tailored frequency response for kick drums and bass-heavy instruments Wide dynamic range for use in high SPL environments Two-position contour switch enhances attack and clarity Integrated preamp and XLR connector reduce stage clutter and provide a quick, secure setup Low profile design requires no external mounting hardware Steel grille and die-cast metal construction resist wear and abuse Specs Type Electret Condenser Frequency Response 20 to 20,000 Hz Polar Pattern Half-cardioid (cardioid in hemisphere above mounting surface) Output Impedance 150 Ω Sensitivity at 1kHz,open circuit voltage -48.5 dBV/Pa(3.8 mV) [1] Maximum SPL 1 kHz at 1% THD [2], 2500 Ω load 155 dB, 1000 Ω load 151 dB Signal-To-Noise Ratio [3] 64.5 dB Dynamic Range at 1kHz, 2500 Ω load 125.5 dB, 1000 Ω load 121.5 dB Clipping Level 20 Hz to 20 kHz, at 1% THD, 2500 Ω load 12.5 dB, 1000 Ω load 7.5 dB Self Noise equivalent SPL, A-weighted, typical 29.5 dB SPL-A Common Mode Rejection (20 Hz to 200 kHz) ≥55 dB Frequency Contour Switch 7 dB of attenuation centered at 400 Hz Power Requirements 11–52 V DC phantom power [4] , 5.4 mA Polarity Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 Weight 470 g(16.6 oz.) Connector Three-pin professional audio (XLR), male, balanced
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