Shure Beta 91A: Precision, Power, and Versatility for Kick Drums and Low-Frequency Applications. The Shure Beta 91A is a premium condenser boundary microphone specifically designed to capture the low-end punch and powerful attack of kick drums and other bass-heavy instruments. Engineered for precision and durability, the Beta 91A combines exceptional sound clarity with rugged construction, making it the go-to choice for professional audio engineers and musicians alike. Whether in a live performance setting or a recording studio, this microphone delivers a tailored frequency response that enhances low-frequency instruments while reducing unwanted noise. Exceptional Performance for Low-Frequency Instruments. At the heart of the Beta 91A is a precision-engineered condenser capsule optimized to capture the rich, deep tones of kick drums and other low-frequency instruments. The microphone’s tailored frequency response delivers an impactful punch and powerful attack, allowing for crisp articulation and definition, even in the densest mix. Whether you are a drummer in a rock band or an audio engineer working on a studio recording, the Beta 91A ensures your low-end instruments cut through the mix with clarity and power. The Beta 91A features a half-cardioid polar pattern, designed to focus on the sound source directly in front of the microphone while minimizing off-axis noise and bleed from other instruments. This results in superior isolation, especially in live settings where multiple sound sources are present. Built to withstand the rigors of professional use, the Beta 91A features a durable die-cast metal construction that ensures long-lasting reliability, whether on the road or in the studio. Its compact boundary design allows for easy placement inside kick drums without the need for a separate stand, and the integrated preamplifier with an XLR output offers convenience for fast setup and minimal clutter on stage or in the recording booth. Switchable Frequency Contour for Added Versatility. To provide greater flexibility for different musical styles and genres, the Beta 91A features a two-position contour switch. This switch allows you to tailor the frequency response of the microphone to suit either a flat response for a natural sound or a low-frequency boost for added “thump” and power. This feature ensures the microphone can adapt to a wide range of musical applications, from rock and metal to jazz and R&B. Tailored Frequency Response: Optimized for kick drums and low-frequency instruments, providing a deep, rich tone with powerful attack. Half-Cardioid Polar Pattern: Provides superior isolation by focusing on the sound source directly in front of the microphone while minimizing background noise. Durable Construction: Die-cast metal design ensures reliability in professional environments, from live performances to studio recordings. Two-Position Contour Switch: Offers a flat response for natural sound or a low-frequency boost for added power and presence. Integrated Preamp with XLR Output: Allows for easy setup and connection to professional audio equipment without the need for an external power supply. Transducer Type: Condenser (electret bias). Frequency Response: 20 Hz – 20 kHz. Polar Pattern: Half-cardioid (boundary). Output Impedance: 146? Maximum SPL: 155 dB SPL. Sensitivity: -48 dBV/Pa (3.98 mV). Power Requirements: Phantom power 11-52 VDC. Weight: 470 g (16.6 oz). What’s in the Box. Shure Beta 91A Boundary Microphone. Whether you’re in a high-pressure live performance or the controlled environment of a studio, the Shure Beta 91A delivers professional-grade sound quality with the reliability and flexibility needed for low-frequency instruments. Its robust design, combined with superior sound isolation and frequency control, makes it an indispensable tool for any audio engineer or musician looking to capture the full impact of kick drums and bass instruments.