The Shure BETA 91A is the inside-the-kick boundary microphone, a low-profile half-cardioid condenser that lies on the shell floor or damping pillow, capturing attack and click with no stand and no repositioning between songs. A two-position contour switch scoops the low-mids for a pre-EQ’d kick sound straight to the desk; it pairs classically with a BETA 52A on the port.
Features
Half-cardioid boundary condenser for kick drum and piano
20Hz-20kHz response
Two-position contour switch (flat / low-mid scoop)
Lies inside the drum, no stand required
Integrated XLR in the low-profile body
Storage bag included
Specifications
| Type | Boundary condenser microphone |
| SKU | BETA 91A |
| Polar pattern | Half-cardioid |
| Frequency response | 20Hz-20kHz |
| Phantom power | 11-52V DC, 5.4mA |
| Impedance | 146Ω (min 1kΩ load) |
| Connector | Integrated XLR |
| Contour | Flat / low-mid scoop switch |












