Shure Beta 91A Condenser Boundary Microphone - The Shure Beta 91™ is specifically designed for kick drums and other bass instruments. The Beta 91 combines superior "attack" and "punch" for studio quality sound.

The Shure Beta 91™ is specifically designed for kick drums and other bass instruments. The Beta 91 combines superior "attack" and "punch" for studio quality sound, even at the extremely high sound pressure levels encountered inside a kick drum. Its boundary effect design produces a strong, solid low-end response that has been specifically tailored for heavy bass applications.

The microphone's cardioid pattern provides outstanding gain-before-feedback and excellent rejection of unwanted sound, making the Beta 91 ideal for live concert applications. The low profile design of the Beta 91 eliminates the need for external mounting hardware, just throw it in your kick drum and play.

Features:
Commercial Audio
Pro Audio

- Frequency response shaped specifically for kick drums and other instruments.
- Wide dynamic range for use in high SPL environments.
- Low-profile design requires no external mounting hardware.
- Detachable cable for easy storage.
- Legendary Shure quality, ruggedness, and reliability.

Model    Beta 91A
Product Type    Condenser Boundary Microphone
Type    Cardioid condenser (electret bias)
Frequency Response    20 to 20,000 Hz
Polar Pattern    Half-cardioid
Output Level (at 1,000 Hz)   
Open Circuit Voltage: -59 dBV/Pa* (1.1 mV) typical
Maximum SPL (20 Hz to 20 kHz, less than 1% THD)   
2.5 kilohm load: 160 dB 1 kilohm load: 156 dB
Preamplifier Output Clipping Level (20 Hz to 20 kHz, less than 1% THD)    2.5 kilohm load: 6 dBV (2.0 V) 1 kilohm load: 2 dBV (1.26 V)
Dynamic Range    125 dB (max SPL minus A-weighted noise)
Output Noise    35 dB SPL (typical), A-weighted
Signal-to-Noise Ratio    59 dB re 94 dB SPL
Output Impedance    150 ohms (actual)
Polarity    Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Power    Phantom Power: 48 Vdc +/- 4 Vdc (IEC-268-15/DIN 45 596), positive pins 2 and 3
Electromagnetic Hum Pickup    -7.5 dB equivalent SPL in 1 mOe field (60 Hz)
Cable    4.6 m (15 ft) heavy-duty, two-conductor shielded, TA4F to TA3F connectors
Case    Matte-black , painted, die-cast, zinc-alloy case with matte-black steel grille
Dimensions    95 mm x 129 mm x 19 mm (3.75 in. x 5.08 in. x 0.75 in.)
Net Weight    0.84 lbs (382 grams) less cable.