Shure Beta 91A Boundary Microphone

The Shure BETA 91A is a boundary microphone that was created for kick drums and any instrument that produces strong low-frequency energy. Its half-cardioid pickup concentrates on the source directly in front of the capsule, giving you high gain before feedback and reducing stage or room spill.

The housing keeps a low profile and hides an onboard preamplifier with a side-exit XLR connector, so setup involves nothing more than a single cable to your mixer or interface. This streamlined approach keeps the stage clear and speeds up changeovers during live shows.

A two-position contour switch offers instant tonal flexibility. Leave it flat when you want a full, natural response, or engage the scoop setting to lift the attack and tighten the low-mid range for rock and modern pop mixes. Switching tones is as simple as reaching for the recessed slider next to the connector.

Engineers trust the Beta 91A in high-SPL environments where lesser mics distort. Whether it is resting on a pillow inside a kick drum, mounted under a piano lid for a clear capture of jazz chords, or positioned on a conference table for corporate events, the capsule delivers consistent clarity and punch.

• Half-cardioid polar pattern focuses on the source and resists feedback
• Frequency response tuned for kick drums and other low-frequency instruments
• Two-position contour switch provides flat or scooped voicing options
• Integrated preamplifier and side-exit XLR connector simplify cabling
• Handles very high sound pressure levels without distortion